Updating the proposed change. This addresses the following:
- Only run from the trigger stage when called from dpkg
- Pass the same environmental flag as update-initramfs does
  (in theory there never should be need to generate an initrd)
- Handle special case of installkernel called multiple times
  with the same version

** Patch added: "Proposed hirsute change (v2)"
   
https://bugs.launchpad.net/ubuntu/+source/linux-base/+bug/1877088/+attachment/5459430/+files/hirsute-linux-base.debdiff

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https://bugs.launchpad.net/bugs/1877088

Title:
  [UBUNTU 20.04] installkernel script does not symlink /boot/initrd.img
  which is required with the default zipl.conf

Status in Ubuntu on IBM z Systems:
  In Progress
Status in debianutils package in Ubuntu:
  New
Status in linux-base package in Ubuntu:
  In Progress

Bug description:
  When testing development kernels I usually rely on the installkernel
  script either through the "make install" target of the Kernel source
  or manually. This used to work great on Ubuntu on Z.

  On Ubuntu 20.04 (freshly installed up to date) this fails however because
  /boot/initrd.img is not updated (/boot/vmlinuz is) and thus zipl installs the
  wrong kernel/initrd combination rendering the system unbootable.

  (with the correct modules already copied to 
/usr/lib/modules/5.7.0-rc4-06500-gb67ea026badd/)
  # sudo installkernel 5.7.0-rc4-06500-gb67ea026badd bzImage System.map /boot
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 
5.7.0-rc4-06500-gb67ea026badd /boot/vmlinuz-5.7.0-rc4-06500-gb67ea026badd
  run-parts: executing /etc/kernel/postinst.d/initramfs-tools 
5.7.0-rc4-06500-gb67ea026badd /boot/vmlinuz-5.7.0-rc4-06500-gb67ea026badd
  update-initramfs: Generating /boot/initrd.img-5.7.0-rc4-06500-gb67ea026badd
  Using config file '/etc/zipl.conf'
  Building bootmap in '/boot'
  Building menu 'menu'
  Adding #1: IPL section 'ubuntu' (default)
  Adding #2: IPL section 'old'
  Preparing boot device: dasda (3844).
  Done.
  run-parts: executing /etc/kernel/postinst.d/zz-zipl 
5.7.0-rc4-06500-gb67ea026badd /boot/vmlinuz-5.7.0-rc4-06500-gb67ea026badd
  Using config file '/etc/zipl.conf'
  Building bootmap in '/boot'
  Building menu 'menu'
  Adding #1: IPL section 'ubuntu' (default)
  Adding #2: IPL section 'old'
  Preparing boot device: dasda (3844).
  Done.
  # ls -l /boot
  total 178364
  -rw------- 1 root root    135168 May  6 11:52 bootmap
  -rw-r--r-- 1 root root     90471 Apr 29 15:34 config-5.4.0-29-generic
  lrwxrwxrwx 1 root root        27 May  6 11:40 initrd.img -> 
initrd.img-5.4.0-29-generic   <====== should point to new version
  -rw-r--r-- 1 root root  19663996 May  6 11:42 initrd.img-5.4.0-29-generic
  -rw-r--r-- 1 root root 125339494 May  6 11:52 
initrd.img-5.7.0-rc4-06500-gb67ea026badd
  lrwxrwxrwx 1 root root        27 May  6 11:40 initrd.img.old -> 
initrd.img-5.4.0-29-generic
  -rw------- 1 root root   3087920 Apr 29 15:34 System.map-5.4.0-29-generic
  -rw-r--r-- 1 root root   4031691 May  6 11:52 
System.map-5.7.0-rc4-06500-gb67ea026badd
  -rw-r--r-- 1 root root   4031691 May  6 11:49 
System.map-5.7.0-rc4-06500-gb67ea026badd.old
  lrwxrwxrwx 1 root root        37 May  6 11:52 vmlinuz -> 
vmlinuz-5.7.0-rc4-06500-gb67ea026badd
  -rw------- 1 root root   8086072 Apr 29 15:54 vmlinuz-5.4.0-29-generic
  -rw-r--r-- 1 root root   9080832 May  6 11:52 
vmlinuz-5.7.0-rc4-06500-gb67ea026badd
  -rw-r--r-- 1 root root   9080832 May  6 11:49 
vmlinuz-5.7.0-rc4-06500-gb67ea026badd.old
  lrwxrwxrwx 1 root root        41 May  6 11:52 vmlinuz.old -> 
vmlinuz-5.7.0-rc4-06500-gb67ea026badd.old

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