[Bug 1968154] Re: Only keep 2 kernels

Ivan T 1968154 at bugs.launchpad.net
Thu Sep 21 03:41:33 UTC 2023 

I had the same issue as bmaupin

/boot$ df -h .
Filesystem                Size  Used Avail Use% Mounted on
bpool/BOOT/ubuntu_azukaj  1.1G  590M  476M  56% /boot


/boot$ ls -lart
total 603325
drwxr-xr-x  4 root root      4096  1月  1  1970 efi
-rw-r--r--  1 root root    184980  2月  7  2022 memtest86+_multiboot.bin
-rw-r--r--  1 root root    184476  2月  7  2022 memtest86+.elf
-rw-r--r--  1 root root    182800  2月  7  2022 memtest86+.bin
drwxr-xr-x 19 root root        25 10月  8  2022 ..
-rw-------  1 root root   6261790  5月 15 22:10 System.map-5.15.0-73-generic
-rw-r--r--  1 root root    261914  5月 15 22:10 config-5.15.0-73-generic
-rw-------  1 root root  11574280  5月 15 22:50 vmlinuz-5.15.0-73-generic
-rw-r--r--  1 root root 133982499  7月 13 13:28 initrd.img-5.15.0-73-generic
-rw-------  1 root root   6273612  8月 14 18:05 System.map-5.15.0-83-generic
-rw-r--r--  1 root root    262053  8月 14 18:05 config-5.15.0-83-generic
-rw-------  1 root root  11615656  8月 14 18:07 vmlinuz-5.15.0-83-generic
-rw-------  1 root root   7967590  8月 16 18:42 System.map-6.2.0-31-generic
-rw-r--r--  1 root root    275587  8月 16 18:42 config-6.2.0-31-generic
-rw-------  1 root root  13796616  8月 16 21:43 vmlinuz-6.2.0-31-generic
-rw-------  1 root root   7969006  8月 18 18:38 System.map-6.2.0-32-generic
-rw-r--r--  1 root root    275587  8月 18 18:38 config-6.2.0-32-generic
-rw-------  1 root root  13791304  8月 18 18:40 vmlinuz-6.2.0-32-generic
-rw-r--r--  1 root root 145066694  9月  3 06:34 initrd.img-6.2.0-31-generic
-rw-r--r--  1 root root 132973394  9月 11 11:53 initrd.img-5.15.0-83-generic
lrwxrwxrwx  1 root root        25  9月 11 11:57 vmlinuz.old -> vmlinuz-5.15.0-83-generic
lrwxrwxrwx  1 root root        24  9月 11 11:57 vmlinuz -> vmlinuz-6.2.0-32-generic
lrwxrwxrwx  1 root root        28  9月 11 11:57 initrd.img.old -> initrd.img-5.15.0-83-generic
lrwxrwxrwx  1 root root        27  9月 11 11:57 initrd.img -> initrd.img-6.2.0-32-generic
-rw-r--r--  1 root root 145040737  9月 11 11:58 initrd.img-6.2.0-32-generic
drwxr-xr-x  4 root root        27  9月 11 12:01 .
drwxr-xr-x  5 root root      4096  9月 21 11:53 grub


so I tried 

/boot$ sudo apt purge linux-image-5.15.0-73-generic linux-headers-5.15.0-73-generic
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
  linux-image-unsigned-5.15.0-73-generic
Suggested packages:
  fdutils linux-doc | linux-source-5.15.0 linux-tools linux-headers-5.15.0-73-generic
The following packages will be REMOVED:
  linux-headers-5.15.0-73-generic* linux-image-5.15.0-73-generic*
The following NEW packages will be installed:
  linux-image-unsigned-5.15.0-73-generic
0 upgraded, 1 newly installed, 2 to remove and 213 not upgraded.
Need to get 11.7 MB of archives.
After this operation, 24.3 MB disk space will be freed.
Do you want to continue? [Y/n] y
Get:1 http://jp.archive.ubuntu.com/ubuntu jammy-updates/main amd64 linux-image-unsigned-5.15.0-73-generic amd64 5.15.0-73.80 [11.7 MB]
Fetched 11.7 MB in 5s (2,290 kB/s)                                 
(Reading database ... 419503 files and directories currently installed.)
Removing linux-headers-5.15.0-73-generic (5.15.0-73.80) ...
dpkg: linux-image-5.15.0-73-generic: dependency problems, but removing anyway as you requested:
 linux-modules-extra-5.15.0-73-generic depends on linux-image-5.15.0-73-generic | linux-image-unsigned-5.15.0-73-generic; however:
  Package linux-image-5.15.0-73-generic is to be removed.
  Package linux-image-unsigned-5.15.0-73-generic is not installed.
 linux-modules-5.15.0-73-generic depends on linux-image-5.15.0-73-generic | linux-image-unsigned-5.15.0-73-generic; however:
  Package linux-image-5.15.0-73-generic is to be removed.
  Package linux-image-unsigned-5.15.0-73-generic is not installed.

Removing linux-image-5.15.0-73-generic (5.15.0-73.80) ...
/etc/kernel/prerm.d/dkms:
dkms: removing: virtualbox 6.1.38 (5.15.0-73-generic) (x86_64)
Module virtualbox-6.1.38 for kernel 5.15.0-73-generic (x86_64).
Before uninstall, this module version was ACTIVE on this kerne

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https://bugs.launchpad.net/bugs/1968154

Title:
  Only keep 2 kernels

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Bionic:
  Fix Released
Status in apt source package in Focal:
  Fix Released
Status in apt source package in Impish:
  Fix Released

Bug description:
  [Impact]
  APT currently keeps 3 kernels or even 4 in some releases. Our boot partition is sized for a steady state of 2 kernels + 1 new one being unpacked, hence users run out of space and new kernels fail to install, upgrade runs might abort in the middle. It's not nice.

  [Test plan]
  1. Have two kernels installed (let's call them version 3, 2)
  2. Check that both kernels are not autoremovable
  3. Install an old kernel (let's call it 1), and mark it automatic
  4. Check that 1 will be autoremovable (apt autoremove -s)
  5. Reboot into 1, check that 2 is autoremovable (apt autoremove -s)
  6. Actually remove 2
  7. Reboot into 3 and check that both 1 and 3 are now not autoremovable

  [Where problems could occur]
  We could keep the wrong kernels installed that the user did not expect.

  We remove the requirement to keep the most recently installed version,
  previously recorded in APT::LastInstalledKernel, to achieve this, as
  we had 3 hard requirements so far:

  1. keep booted kernel
  2. keep highest version
  3. keep most recently installed

  1 can't be removed as it would break running systems, 2 is what you
  definitely want to keep.

  During normal system lifetime, the most recently installed kernel is
  the same as the highest version, so 2==3, and there are no changes to
  behavior.

  Likewise, if you most recently installed an older kernel manually for
  debugging, it would be manually installed and not subject to removal,
  even if the rule is dropped.

  The behavior really only changes if you install an older kernel, and
  then mark it auto - that older kernel becomes automatically removable
  immediately after it is marked as auto.

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