Public bug reported:

My Ubuntu VM started to boot very slowly immediately after it has been
upgraded to linux 4.15.0-24. So it seems it is a regression. With
4.15.0-23 it boots normally.

~$ uname -a
Linux 1C-Q35 4.15.0-24-generic #26-Ubuntu SMP Wed Jun 13 08:44:47 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux

~$ cat /proc/version_signature
Ubuntu 4.15.0-24.26-generic 4.15.18

~$ systemd-analyze blame
   11min 41.457s plymouth-quit-wait.service
          5.684s srv1cv83.service
          1.601s networkd-dispatcher.service
          1.491s NetworkManager.service
          1.336s udisks2.service
          1.295s ModemManager.service
          1.255s accounts-daemon.service
          1.121s thermald.service
          1.082s grub-common.service

~$ systemd-analyze critical-chain
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.

graphical.target @11min 43.954s
└─multi-user.target @11min 43.954s
  └─anacron.service @8min 58.982s
    └─basic.target @912ms
      └─paths.target @912ms
        └─cups.path @912ms
          └─sysinit.target @909ms
            └─apparmor.service @471ms +438ms
              └─local-fs.target @462ms
                └─run-user-1001-gvfs.mount @11min 24.915s
                  └─run-user-1001.mount @3.021s
                    └─swap.target @395ms
                      
└─dev-disk-by\x2duuid-82c9d942\x2d61f4\x2d42fc\x2dbddc\x2dfdb02217509d.swap 
@378ms +16ms
                        
└─dev-disk-by\x2duuid-82c9d942\x2d61f4\x2d42fc\x2dbddc\x2dfdb02217509d.device 
@378ms

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-24-generic 4.15.0-24.26
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  accountant   1136 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Wed Jul  4 23:17:49 2018
HibernationDevice: RESUME=UUID=82c9d942-61f4-42fc-bddc-fdb02217509d
InstallationDate: Installed on 2018-06-05 (29 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
IwConfig:
 lo        no wireless extensions.

 enp1s0    no wireless extensions.
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: QEMU Standard PC (Q35 + ICH9, 2009)
ProcFB: 0 qxldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.15.0-24-generic 
root=UUID=959b7c8f-048c-4d32-b999-f00713e22153 ro rootflags=subvol=@ quiet 
splash vt.handoff=1
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-24-generic N/A
 linux-backports-modules-4.15.0-24-generic  N/A
 linux-firmware                             1.173.1
RfKill:

SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:

dmi.bios.date: 02/06/2015
dmi.bios.vendor: EFI Development Kit II / OVMF
dmi.bios.version: 0.0.0
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-q35-2.11
dmi.modalias: 
dmi:bvnEFIDevelopmentKitII/OVMF:bvr0.0.0:bd02/06/2015:svnQEMU:pnStandardPC(Q35+ICH9,2009):pvrpc-q35-2.11:cvnQEMU:ct1:cvrpc-q35-2.11:
dmi.product.name: Standard PC (Q35 + ICH9, 2009)
dmi.product.version: pc-q35-2.11
dmi.sys.vendor: QEMU

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug bionic

** Description changed:

- Ubuntu started to boot very slowly immediately after it has been
+ My Ubuntu VM started to boot very slowly immediately after it has been
  upgraded to linux 4.15.0-24. So it seems it is a regression. With
  4.15.0-23 it boots normally.
  
  ~$ uname -a
  Linux 1C-Q35 4.15.0-24-generic #26-Ubuntu SMP Wed Jun 13 08:44:47 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux
  
  ~$ cat /proc/version_signature
  Ubuntu 4.15.0-24.26-generic 4.15.18
  
  ~$ systemd-analyze blame
-    11min 41.457s plymouth-quit-wait.service
-           5.684s srv1cv83.service
-           1.601s networkd-dispatcher.service
-           1.491s NetworkManager.service
-           1.336s udisks2.service
-           1.295s ModemManager.service
-           1.255s accounts-daemon.service
-           1.121s thermald.service
-           1.082s grub-common.service
+    11min 41.457s plymouth-quit-wait.service
+           5.684s srv1cv83.service
+           1.601s networkd-dispatcher.service
+           1.491s NetworkManager.service
+           1.336s udisks2.service
+           1.295s ModemManager.service
+           1.255s accounts-daemon.service
+           1.121s thermald.service
+           1.082s grub-common.service
  
- 
- ~$ systemd-analyze critical-chain 
+ ~$ systemd-analyze critical-chain
  The time after the unit is active or started is printed after the "@" 
character.
  The time the unit takes to start is printed after the "+" character.
  
  graphical.target @11min 43.954s
  └─multi-user.target @11min 43.954s
-   └─anacron.service @8min 58.982s
-     └─basic.target @912ms
-       └─paths.target @912ms
-         └─cups.path @912ms
-           └─sysinit.target @909ms
-             └─apparmor.service @471ms +438ms
-               └─local-fs.target @462ms
-                 └─run-user-1001-gvfs.mount @11min 24.915s
-                   └─run-user-1001.mount @3.021s
-                     └─swap.target @395ms
-                       
└─dev-disk-by\x2duuid-82c9d942\x2d61f4\x2d42fc\x2dbddc\x2dfdb02217509d.swap 
@378ms +16ms
-                         
└─dev-disk-by\x2duuid-82c9d942\x2d61f4\x2d42fc\x2dbddc\x2dfdb02217509d.device 
@378ms
+   └─anacron.service @8min 58.982s
+     └─basic.target @912ms
+       └─paths.target @912ms
+         └─cups.path @912ms
+           └─sysinit.target @909ms
+             └─apparmor.service @471ms +438ms
+               └─local-fs.target @462ms
+                 └─run-user-1001-gvfs.mount @11min 24.915s
+                   └─run-user-1001.mount @3.021s
+                     └─swap.target @395ms
+                       
└─dev-disk-by\x2duuid-82c9d942\x2d61f4\x2d42fc\x2dbddc\x2dfdb02217509d.swap 
@378ms +16ms
+                         
└─dev-disk-by\x2duuid-82c9d942\x2d61f4\x2d42fc\x2dbddc\x2dfdb02217509d.device 
@378ms
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-24-generic 4.15.0-24.26
  ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
  Uname: Linux 4.15.0-24-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  accountant   1136 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  accountant   1136 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Jul  4 23:17:49 2018
  HibernationDevice: RESUME=UUID=82c9d942-61f4-42fc-bddc-fdb02217509d
  InstallationDate: Installed on 2018-06-05 (29 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  IwConfig:
-  lo        no wireless extensions.
-  
-  enp1s0    no wireless extensions.
+  lo        no wireless extensions.
+ 
+  enp1s0    no wireless extensions.
  Lsusb:
-  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
-  Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
-  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
+  Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: QEMU Standard PC (Q35 + ICH9, 2009)
  ProcFB: 0 qxldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.15.0-24-generic 
root=UUID=959b7c8f-048c-4d32-b999-f00713e22153 ro rootflags=subvol=@ quiet 
splash vt.handoff=1
  RelatedPackageVersions:
-  linux-restricted-modules-4.15.0-24-generic N/A
-  linux-backports-modules-4.15.0-24-generic  N/A
-  linux-firmware                             1.173.1
+  linux-restricted-modules-4.15.0-24-generic N/A
+  linux-backports-modules-4.15.0-24-generic  N/A
+  linux-firmware                             1.173.1
  RfKill:
-  
+ 
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
-  
+ 
  dmi.bios.date: 02/06/2015
  dmi.bios.vendor: EFI Development Kit II / OVMF
  dmi.bios.version: 0.0.0
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-q35-2.11
  dmi.modalias: 
dmi:bvnEFIDevelopmentKitII/OVMF:bvr0.0.0:bd02/06/2015:svnQEMU:pnStandardPC(Q35+ICH9,2009):pvrpc-q35-2.11:cvnQEMU:ct1:cvrpc-q35-2.11:
  dmi.product.name: Standard PC (Q35 + ICH9, 2009)
  dmi.product.version: pc-q35-2.11
  dmi.sys.vendor: QEMU

-- 
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https://bugs.launchpad.net/bugs/1780155

Title:
  [regression] Ubuntu boots very slowly after kernel upgrading

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  My Ubuntu VM started to boot very slowly immediately after it has been
  upgraded to linux 4.15.0-24. So it seems it is a regression. With
  4.15.0-23 it boots normally.

  ~$ uname -a
  Linux 1C-Q35 4.15.0-24-generic #26-Ubuntu SMP Wed Jun 13 08:44:47 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux

  ~$ cat /proc/version_signature
  Ubuntu 4.15.0-24.26-generic 4.15.18

  ~$ systemd-analyze blame
     11min 41.457s plymouth-quit-wait.service
            5.684s srv1cv83.service
            1.601s networkd-dispatcher.service
            1.491s NetworkManager.service
            1.336s udisks2.service
            1.295s ModemManager.service
            1.255s accounts-daemon.service
            1.121s thermald.service
            1.082s grub-common.service

  ~$ systemd-analyze critical-chain
  The time after the unit is active or started is printed after the "@" 
character.
  The time the unit takes to start is printed after the "+" character.

  graphical.target @11min 43.954s
  └─multi-user.target @11min 43.954s
    └─anacron.service @8min 58.982s
      └─basic.target @912ms
        └─paths.target @912ms
          └─cups.path @912ms
            └─sysinit.target @909ms
              └─apparmor.service @471ms +438ms
                └─local-fs.target @462ms
                  └─run-user-1001-gvfs.mount @11min 24.915s
                    └─run-user-1001.mount @3.021s
                      └─swap.target @395ms
                        
└─dev-disk-by\x2duuid-82c9d942\x2d61f4\x2d42fc\x2dbddc\x2dfdb02217509d.swap 
@378ms +16ms
                          
└─dev-disk-by\x2duuid-82c9d942\x2d61f4\x2d42fc\x2dbddc\x2dfdb02217509d.device 
@378ms

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-24-generic 4.15.0-24.26
  ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
  Uname: Linux 4.15.0-24-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  accountant   1136 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Jul  4 23:17:49 2018
  HibernationDevice: RESUME=UUID=82c9d942-61f4-42fc-bddc-fdb02217509d
  InstallationDate: Installed on 2018-06-05 (29 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  IwConfig:
   lo        no wireless extensions.

   enp1s0    no wireless extensions.
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: QEMU Standard PC (Q35 + ICH9, 2009)
  ProcFB: 0 qxldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.15.0-24-generic 
root=UUID=959b7c8f-048c-4d32-b999-f00713e22153 ro rootflags=subvol=@ quiet 
splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-24-generic N/A
   linux-backports-modules-4.15.0-24-generic  N/A
   linux-firmware                             1.173.1
  RfKill:

  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:

  dmi.bios.date: 02/06/2015
  dmi.bios.vendor: EFI Development Kit II / OVMF
  dmi.bios.version: 0.0.0
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-q35-2.11
  dmi.modalias: 
dmi:bvnEFIDevelopmentKitII/OVMF:bvr0.0.0:bd02/06/2015:svnQEMU:pnStandardPC(Q35+ICH9,2009):pvrpc-q35-2.11:cvnQEMU:ct1:cvrpc-q35-2.11:
  dmi.product.name: Standard PC (Q35 + ICH9, 2009)
  dmi.product.version: pc-q35-2.11
  dmi.sys.vendor: QEMU

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