Public bug reported:

This concerns linux-base 4.0ubuntu1 in Ubuntu Xenial.

Removing Linux kernel packages from the system leads to initrd
generation and causes /var/run/reboot-required to appear. Neither of
these side effects should occur if only kernel packages older than the
running one are removed, a common operation in system maintenance.

Below is a terminal session illustrating the problem. Note the update-
initramfs lines indicating that an initrd is being (re)generated. The
removal process paused for a few seconds at these lines, because
generating an initrd is somewhat disk- and CPU-intensive. (Look closely
at the versions of the initrd that are generated---the system is
refreshing initrd files for the kernel versions that are being removed!)

==== Terminal log begins ====

# ls /var/run/reboot-required
ls: cannot access '/var/run/reboot-required': No such file or directory

# apt-get --purge autoremove
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  linux-headers-4.4.0-83* linux-headers-4.4.0-83-generic*
  linux-headers-4.4.0-87* linux-headers-4.4.0-87-generic*
  linux-headers-4.4.0-89* linux-headers-4.4.0-89-generic*
  linux-headers-4.4.0-91* linux-headers-4.4.0-91-generic*
  linux-image-4.4.0-83-generic* linux-image-4.4.0-87-generic*
  linux-image-4.4.0-89-generic* linux-image-4.4.0-91-generic*
  linux-image-extra-4.4.0-83-generic* linux-image-extra-4.4.0-87-generic*
  linux-image-extra-4.4.0-89-generic* linux-image-extra-4.4.0-91-generic*
0 upgraded, 0 newly installed, 16 to remove and 0 not upgraded.
After this operation, 1,188 MB disk space will be freed.
Do you want to continue? [Y/n] 
(Reading database ... 353048 files and directories currently installed.)
Removing linux-headers-4.4.0-83-generic (4.4.0-83.106) ...
Removing linux-headers-4.4.0-83 (4.4.0-83.106) ...
Removing linux-headers-4.4.0-87-generic (4.4.0-87.110) ...
Removing linux-headers-4.4.0-87 (4.4.0-87.110) ...
Removing linux-headers-4.4.0-89-generic (4.4.0-89.112) ...
Removing linux-headers-4.4.0-89 (4.4.0-89.112) ...
Removing linux-headers-4.4.0-91-generic (4.4.0-91.114) ...
Removing linux-headers-4.4.0-91 (4.4.0-91.114) ...
Removing linux-image-extra-4.4.0-83-generic (4.4.0-83.106) ...
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-83-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 
4.4.0-83-generic /boot/vmlinuz-4.4.0-83-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-96-generic
Found initrd image: /boot/initrd.img-4.4.0-96-generic
Found linux image: /boot/vmlinuz-4.4.0-93-generic
Found initrd image: /boot/initrd.img-4.4.0-93-generic
Found linux image: /boot/vmlinuz-4.4.0-92-generic
Found initrd image: /boot/initrd.img-4.4.0-92-generic
Found linux image: /boot/vmlinuz-4.4.0-91-generic
Found initrd image: /boot/initrd.img-4.4.0-91-generic
Found linux image: /boot/vmlinuz-4.4.0-89-generic
Found initrd image: /boot/initrd.img-4.4.0-89-generic
Found linux image: /boot/vmlinuz-4.4.0-87-generic
Found initrd image: /boot/initrd.img-4.4.0-87-generic
Found linux image: /boot/vmlinuz-4.4.0-83-generic
Found initrd image: /boot/initrd.img-4.4.0-83-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
Purging configuration files for linux-image-extra-4.4.0-83-generic 
(4.4.0-83.106) ...
Removing linux-image-4.4.0-83-generic (4.4.0-83.106) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
update-initramfs: Deleting /boot/initrd.img-4.4.0-83-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-96-generic
Found initrd image: /boot/initrd.img-4.4.0-96-generic
Found linux image: /boot/vmlinuz-4.4.0-93-generic
Found initrd image: /boot/initrd.img-4.4.0-93-generic
Found linux image: /boot/vmlinuz-4.4.0-92-generic
Found initrd image: /boot/initrd.img-4.4.0-92-generic
Found linux image: /boot/vmlinuz-4.4.0-91-generic
Found initrd image: /boot/initrd.img-4.4.0-91-generic
Found linux image: /boot/vmlinuz-4.4.0-89-generic
Found initrd image: /boot/initrd.img-4.4.0-89-generic
Found linux image: /boot/vmlinuz-4.4.0-87-generic
Found initrd image: /boot/initrd.img-4.4.0-87-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
Purging configuration files for linux-image-4.4.0-83-generic (4.4.0-83.106) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
Removing linux-image-extra-4.4.0-87-generic (4.4.0-87.110) ...
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-87-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 
4.4.0-87-generic /boot/vmlinuz-4.4.0-87-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-96-generic
Found initrd image: /boot/initrd.img-4.4.0-96-generic
Found linux image: /boot/vmlinuz-4.4.0-93-generic
Found initrd image: /boot/initrd.img-4.4.0-93-generic
Found linux image: /boot/vmlinuz-4.4.0-92-generic
Found initrd image: /boot/initrd.img-4.4.0-92-generic
Found linux image: /boot/vmlinuz-4.4.0-91-generic
Found initrd image: /boot/initrd.img-4.4.0-91-generic
Found linux image: /boot/vmlinuz-4.4.0-89-generic
Found initrd image: /boot/initrd.img-4.4.0-89-generic
Found linux image: /boot/vmlinuz-4.4.0-87-generic
Found initrd image: /boot/initrd.img-4.4.0-87-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
Purging configuration files for linux-image-extra-4.4.0-87-generic 
(4.4.0-87.110) ...
Removing linux-image-4.4.0-87-generic (4.4.0-87.110) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
update-initramfs: Deleting /boot/initrd.img-4.4.0-87-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-96-generic
Found initrd image: /boot/initrd.img-4.4.0-96-generic
Found linux image: /boot/vmlinuz-4.4.0-93-generic
Found initrd image: /boot/initrd.img-4.4.0-93-generic
Found linux image: /boot/vmlinuz-4.4.0-92-generic
Found initrd image: /boot/initrd.img-4.4.0-92-generic
Found linux image: /boot/vmlinuz-4.4.0-91-generic
Found initrd image: /boot/initrd.img-4.4.0-91-generic
Found linux image: /boot/vmlinuz-4.4.0-89-generic
Found initrd image: /boot/initrd.img-4.4.0-89-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
Purging configuration files for linux-image-4.4.0-87-generic (4.4.0-87.110) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
Removing linux-image-extra-4.4.0-89-generic (4.4.0-89.112) ...
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-89-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 
4.4.0-89-generic /boot/vmlinuz-4.4.0-89-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-96-generic
Found initrd image: /boot/initrd.img-4.4.0-96-generic
Found linux image: /boot/vmlinuz-4.4.0-93-generic
Found initrd image: /boot/initrd.img-4.4.0-93-generic
Found linux image: /boot/vmlinuz-4.4.0-92-generic
Found initrd image: /boot/initrd.img-4.4.0-92-generic
Found linux image: /boot/vmlinuz-4.4.0-91-generic
Found initrd image: /boot/initrd.img-4.4.0-91-generic
Found linux image: /boot/vmlinuz-4.4.0-89-generic
Found initrd image: /boot/initrd.img-4.4.0-89-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
Purging configuration files for linux-image-extra-4.4.0-89-generic 
(4.4.0-89.112) ...
Removing linux-image-4.4.0-89-generic (4.4.0-89.112) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
update-initramfs: Deleting /boot/initrd.img-4.4.0-89-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-96-generic
Found initrd image: /boot/initrd.img-4.4.0-96-generic
Found linux image: /boot/vmlinuz-4.4.0-93-generic
Found initrd image: /boot/initrd.img-4.4.0-93-generic
Found linux image: /boot/vmlinuz-4.4.0-92-generic
Found initrd image: /boot/initrd.img-4.4.0-92-generic
Found linux image: /boot/vmlinuz-4.4.0-91-generic
Found initrd image: /boot/initrd.img-4.4.0-91-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
Purging configuration files for linux-image-4.4.0-89-generic (4.4.0-89.112) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
Removing linux-image-extra-4.4.0-91-generic (4.4.0-91.114) ...
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-91-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 
4.4.0-91-generic /boot/vmlinuz-4.4.0-91-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-96-generic
Found initrd image: /boot/initrd.img-4.4.0-96-generic
Found linux image: /boot/vmlinuz-4.4.0-93-generic
Found initrd image: /boot/initrd.img-4.4.0-93-generic
Found linux image: /boot/vmlinuz-4.4.0-92-generic
Found initrd image: /boot/initrd.img-4.4.0-92-generic
Found linux image: /boot/vmlinuz-4.4.0-91-generic
Found initrd image: /boot/initrd.img-4.4.0-91-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
Purging configuration files for linux-image-extra-4.4.0-91-generic 
(4.4.0-91.114) ...
Removing linux-image-4.4.0-91-generic (4.4.0-91.114) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
update-initramfs: Deleting /boot/initrd.img-4.4.0-91-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-96-generic
Found initrd image: /boot/initrd.img-4.4.0-96-generic
Found linux image: /boot/vmlinuz-4.4.0-93-generic
Found initrd image: /boot/initrd.img-4.4.0-93-generic
Found linux image: /boot/vmlinuz-4.4.0-92-generic
Found initrd image: /boot/initrd.img-4.4.0-92-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
Purging configuration files for linux-image-4.4.0-91-generic (4.4.0-91.114) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic

# cat /var/run/reboot-required
*** System restart required ***

# cat /var/run/reboot-required.pkgs
linux-base
linux-base
linux-base
linux-base

** Affects: linux-base (Ubuntu)
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-base in Ubuntu.
https://bugs.launchpad.net/bugs/1722027

Title:
  Removing kernel packages leads to initrd regens, reboot-required

Status in linux-base package in Ubuntu:
  New

Bug description:
  This concerns linux-base 4.0ubuntu1 in Ubuntu Xenial.

  Removing Linux kernel packages from the system leads to initrd
  generation and causes /var/run/reboot-required to appear. Neither of
  these side effects should occur if only kernel packages older than the
  running one are removed, a common operation in system maintenance.

  Below is a terminal session illustrating the problem. Note the update-
  initramfs lines indicating that an initrd is being (re)generated. The
  removal process paused for a few seconds at these lines, because
  generating an initrd is somewhat disk- and CPU-intensive. (Look
  closely at the versions of the initrd that are generated---the system
  is refreshing initrd files for the kernel versions that are being
  removed!)

  ==== Terminal log begins ====

  # ls /var/run/reboot-required
  ls: cannot access '/var/run/reboot-required': No such file or directory

  # apt-get --purge autoremove
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  The following packages will be REMOVED:
    linux-headers-4.4.0-83* linux-headers-4.4.0-83-generic*
    linux-headers-4.4.0-87* linux-headers-4.4.0-87-generic*
    linux-headers-4.4.0-89* linux-headers-4.4.0-89-generic*
    linux-headers-4.4.0-91* linux-headers-4.4.0-91-generic*
    linux-image-4.4.0-83-generic* linux-image-4.4.0-87-generic*
    linux-image-4.4.0-89-generic* linux-image-4.4.0-91-generic*
    linux-image-extra-4.4.0-83-generic* linux-image-extra-4.4.0-87-generic*
    linux-image-extra-4.4.0-89-generic* linux-image-extra-4.4.0-91-generic*
  0 upgraded, 0 newly installed, 16 to remove and 0 not upgraded.
  After this operation, 1,188 MB disk space will be freed.
  Do you want to continue? [Y/n] 
  (Reading database ... 353048 files and directories currently installed.)
  Removing linux-headers-4.4.0-83-generic (4.4.0-83.106) ...
  Removing linux-headers-4.4.0-83 (4.4.0-83.106) ...
  Removing linux-headers-4.4.0-87-generic (4.4.0-87.110) ...
  Removing linux-headers-4.4.0-87 (4.4.0-87.110) ...
  Removing linux-headers-4.4.0-89-generic (4.4.0-89.112) ...
  Removing linux-headers-4.4.0-89 (4.4.0-89.112) ...
  Removing linux-headers-4.4.0-91-generic (4.4.0-91.114) ...
  Removing linux-headers-4.4.0-91 (4.4.0-91.114) ...
  Removing linux-image-extra-4.4.0-83-generic (4.4.0-83.106) ...
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
  run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
  update-initramfs: Generating /boot/initrd.img-4.4.0-83-generic
  run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
  run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 
4.4.0-83-generic /boot/vmlinuz-4.4.0-83-generic
  run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
  run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
  Generating grub configuration file ...
  Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
  Found linux image: /boot/vmlinuz-4.4.0-96-generic
  Found initrd image: /boot/initrd.img-4.4.0-96-generic
  Found linux image: /boot/vmlinuz-4.4.0-93-generic
  Found initrd image: /boot/initrd.img-4.4.0-93-generic
  Found linux image: /boot/vmlinuz-4.4.0-92-generic
  Found initrd image: /boot/initrd.img-4.4.0-92-generic
  Found linux image: /boot/vmlinuz-4.4.0-91-generic
  Found initrd image: /boot/initrd.img-4.4.0-91-generic
  Found linux image: /boot/vmlinuz-4.4.0-89-generic
  Found initrd image: /boot/initrd.img-4.4.0-89-generic
  Found linux image: /boot/vmlinuz-4.4.0-87-generic
  Found initrd image: /boot/initrd.img-4.4.0-87-generic
  Found linux image: /boot/vmlinuz-4.4.0-83-generic
  Found initrd image: /boot/initrd.img-4.4.0-83-generic
  Found memtest86+ image: /boot/memtest86+.elf
  Found memtest86+ image: /boot/memtest86+.bin
  done
  Purging configuration files for linux-image-extra-4.4.0-83-generic 
(4.4.0-83.106) ...
  Removing linux-image-4.4.0-83-generic (4.4.0-83.106) ...
  Examining /etc/kernel/postrm.d .
  run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
  update-initramfs: Deleting /boot/initrd.img-4.4.0-83-generic
  run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
  Generating grub configuration file ...
  Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
  Found linux image: /boot/vmlinuz-4.4.0-96-generic
  Found initrd image: /boot/initrd.img-4.4.0-96-generic
  Found linux image: /boot/vmlinuz-4.4.0-93-generic
  Found initrd image: /boot/initrd.img-4.4.0-93-generic
  Found linux image: /boot/vmlinuz-4.4.0-92-generic
  Found initrd image: /boot/initrd.img-4.4.0-92-generic
  Found linux image: /boot/vmlinuz-4.4.0-91-generic
  Found initrd image: /boot/initrd.img-4.4.0-91-generic
  Found linux image: /boot/vmlinuz-4.4.0-89-generic
  Found initrd image: /boot/initrd.img-4.4.0-89-generic
  Found linux image: /boot/vmlinuz-4.4.0-87-generic
  Found initrd image: /boot/initrd.img-4.4.0-87-generic
  Found memtest86+ image: /boot/memtest86+.elf
  Found memtest86+ image: /boot/memtest86+.bin
  done
  Purging configuration files for linux-image-4.4.0-83-generic (4.4.0-83.106) 
...
  Examining /etc/kernel/postrm.d .
  run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
  run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-83-generic 
/boot/vmlinuz-4.4.0-83-generic
  Removing linux-image-extra-4.4.0-87-generic (4.4.0-87.110) ...
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
  run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
  update-initramfs: Generating /boot/initrd.img-4.4.0-87-generic
  run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
  run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 
4.4.0-87-generic /boot/vmlinuz-4.4.0-87-generic
  run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
  run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
  Generating grub configuration file ...
  Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
  Found linux image: /boot/vmlinuz-4.4.0-96-generic
  Found initrd image: /boot/initrd.img-4.4.0-96-generic
  Found linux image: /boot/vmlinuz-4.4.0-93-generic
  Found initrd image: /boot/initrd.img-4.4.0-93-generic
  Found linux image: /boot/vmlinuz-4.4.0-92-generic
  Found initrd image: /boot/initrd.img-4.4.0-92-generic
  Found linux image: /boot/vmlinuz-4.4.0-91-generic
  Found initrd image: /boot/initrd.img-4.4.0-91-generic
  Found linux image: /boot/vmlinuz-4.4.0-89-generic
  Found initrd image: /boot/initrd.img-4.4.0-89-generic
  Found linux image: /boot/vmlinuz-4.4.0-87-generic
  Found initrd image: /boot/initrd.img-4.4.0-87-generic
  Found memtest86+ image: /boot/memtest86+.elf
  Found memtest86+ image: /boot/memtest86+.bin
  done
  Purging configuration files for linux-image-extra-4.4.0-87-generic 
(4.4.0-87.110) ...
  Removing linux-image-4.4.0-87-generic (4.4.0-87.110) ...
  Examining /etc/kernel/postrm.d .
  run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
  update-initramfs: Deleting /boot/initrd.img-4.4.0-87-generic
  run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
  Generating grub configuration file ...
  Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
  Found linux image: /boot/vmlinuz-4.4.0-96-generic
  Found initrd image: /boot/initrd.img-4.4.0-96-generic
  Found linux image: /boot/vmlinuz-4.4.0-93-generic
  Found initrd image: /boot/initrd.img-4.4.0-93-generic
  Found linux image: /boot/vmlinuz-4.4.0-92-generic
  Found initrd image: /boot/initrd.img-4.4.0-92-generic
  Found linux image: /boot/vmlinuz-4.4.0-91-generic
  Found initrd image: /boot/initrd.img-4.4.0-91-generic
  Found linux image: /boot/vmlinuz-4.4.0-89-generic
  Found initrd image: /boot/initrd.img-4.4.0-89-generic
  Found memtest86+ image: /boot/memtest86+.elf
  Found memtest86+ image: /boot/memtest86+.bin
  done
  Purging configuration files for linux-image-4.4.0-87-generic (4.4.0-87.110) 
...
  Examining /etc/kernel/postrm.d .
  run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
  run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-87-generic 
/boot/vmlinuz-4.4.0-87-generic
  Removing linux-image-extra-4.4.0-89-generic (4.4.0-89.112) ...
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
  run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
  update-initramfs: Generating /boot/initrd.img-4.4.0-89-generic
  run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
  run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 
4.4.0-89-generic /boot/vmlinuz-4.4.0-89-generic
  run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
  run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
  Generating grub configuration file ...
  Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
  Found linux image: /boot/vmlinuz-4.4.0-96-generic
  Found initrd image: /boot/initrd.img-4.4.0-96-generic
  Found linux image: /boot/vmlinuz-4.4.0-93-generic
  Found initrd image: /boot/initrd.img-4.4.0-93-generic
  Found linux image: /boot/vmlinuz-4.4.0-92-generic
  Found initrd image: /boot/initrd.img-4.4.0-92-generic
  Found linux image: /boot/vmlinuz-4.4.0-91-generic
  Found initrd image: /boot/initrd.img-4.4.0-91-generic
  Found linux image: /boot/vmlinuz-4.4.0-89-generic
  Found initrd image: /boot/initrd.img-4.4.0-89-generic
  Found memtest86+ image: /boot/memtest86+.elf
  Found memtest86+ image: /boot/memtest86+.bin
  done
  Purging configuration files for linux-image-extra-4.4.0-89-generic 
(4.4.0-89.112) ...
  Removing linux-image-4.4.0-89-generic (4.4.0-89.112) ...
  Examining /etc/kernel/postrm.d .
  run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
  update-initramfs: Deleting /boot/initrd.img-4.4.0-89-generic
  run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
  Generating grub configuration file ...
  Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
  Found linux image: /boot/vmlinuz-4.4.0-96-generic
  Found initrd image: /boot/initrd.img-4.4.0-96-generic
  Found linux image: /boot/vmlinuz-4.4.0-93-generic
  Found initrd image: /boot/initrd.img-4.4.0-93-generic
  Found linux image: /boot/vmlinuz-4.4.0-92-generic
  Found initrd image: /boot/initrd.img-4.4.0-92-generic
  Found linux image: /boot/vmlinuz-4.4.0-91-generic
  Found initrd image: /boot/initrd.img-4.4.0-91-generic
  Found memtest86+ image: /boot/memtest86+.elf
  Found memtest86+ image: /boot/memtest86+.bin
  done
  Purging configuration files for linux-image-4.4.0-89-generic (4.4.0-89.112) 
...
  Examining /etc/kernel/postrm.d .
  run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
  run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-89-generic 
/boot/vmlinuz-4.4.0-89-generic
  Removing linux-image-extra-4.4.0-91-generic (4.4.0-91.114) ...
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
  run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
  update-initramfs: Generating /boot/initrd.img-4.4.0-91-generic
  run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
  run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 
4.4.0-91-generic /boot/vmlinuz-4.4.0-91-generic
  run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
  run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
  Generating grub configuration file ...
  Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
  Found linux image: /boot/vmlinuz-4.4.0-96-generic
  Found initrd image: /boot/initrd.img-4.4.0-96-generic
  Found linux image: /boot/vmlinuz-4.4.0-93-generic
  Found initrd image: /boot/initrd.img-4.4.0-93-generic
  Found linux image: /boot/vmlinuz-4.4.0-92-generic
  Found initrd image: /boot/initrd.img-4.4.0-92-generic
  Found linux image: /boot/vmlinuz-4.4.0-91-generic
  Found initrd image: /boot/initrd.img-4.4.0-91-generic
  Found memtest86+ image: /boot/memtest86+.elf
  Found memtest86+ image: /boot/memtest86+.bin
  done
  Purging configuration files for linux-image-extra-4.4.0-91-generic 
(4.4.0-91.114) ...
  Removing linux-image-4.4.0-91-generic (4.4.0-91.114) ...
  Examining /etc/kernel/postrm.d .
  run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
  update-initramfs: Deleting /boot/initrd.img-4.4.0-91-generic
  run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
  Generating grub configuration file ...
  Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
  Found linux image: /boot/vmlinuz-4.4.0-96-generic
  Found initrd image: /boot/initrd.img-4.4.0-96-generic
  Found linux image: /boot/vmlinuz-4.4.0-93-generic
  Found initrd image: /boot/initrd.img-4.4.0-93-generic
  Found linux image: /boot/vmlinuz-4.4.0-92-generic
  Found initrd image: /boot/initrd.img-4.4.0-92-generic
  Found memtest86+ image: /boot/memtest86+.elf
  Found memtest86+ image: /boot/memtest86+.bin
  done
  Purging configuration files for linux-image-4.4.0-91-generic (4.4.0-91.114) 
...
  Examining /etc/kernel/postrm.d .
  run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic
  run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-91-generic 
/boot/vmlinuz-4.4.0-91-generic

  # cat /var/run/reboot-required
  *** System restart required ***

  # cat /var/run/reboot-required.pkgs
  linux-base
  linux-base
  linux-base
  linux-base

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