[Bug 1988299] Re: Can't upgrade from 20.04 to 22.04 due to extreme space requirement for /boot

[Renan Rodrigo]

Ok I'm having the very same problem now when upgrading from 22.04 to 24.04.
- The automatic size that the installer chose for my /boot partition is 704M (no questions asked).
- When upgrading to 22.04 from 20.04 I had to manually remove old kernels. Just any kernel update on Jammy nowadays makes me go there and remove everything manually which is enough of a pain.
- On the upgrade from Jammy to Noble, even with a single kernel (the running one) I have no space to go further. And I'm not missing a little : Uvolněte prosím alespoň 130 M dodatečného místa na „/boot”. I ain't getting 130M on /boot here or there.

The questions are many, and were asked but not answered somewhere else.
- Am I stuck with Jammy unless I backup everything and do a reinstall?
- Isn't it a bug in the installer that I couldn't choose a /boot size when I enabled the LUKS encryption?

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Title:
  Can't upgrade from 20.04 to 22.04 due to extreme space requirement for
  /boot

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged

Bug description:
  I'm attempting to upgrade from 20.04 to 22.04 and my installation uses
  full disk encryption, so I have a separate partition for /boot.

  The size of the /boot partition was set by the installer for 20.04 (to
  704 MiB) and I currently have 329 MiB free after removing old kernels
  with apt autoremove:

    $ df -h /boot
    Filesystem      Size  Used Avail Use% Mounted on
    /dev/sdb2       704M  324M  329M  50% /boot

  When attempting to upgrade to 22.04 it fails with:

    The upgrade has aborted. The upgrade needs a total of 787 M free
    space on disk '/boot'. Please free at least an additional 442 M of
    disk space on '/boot'. You can remove old kernels using 'sudo apt
    autoremove' and you could also set COMPRESS=xz in
    /etc/initramfs-tools/initramfs.conf to reduce the size of your
    initramfs.

  So it claims to need more space than the total size of the partition
  (so presumably no amount of compressing initramfs will be enough!),
  which as noted above is the default size for /boot chosen by the 20.04
  installer.

  Another instance of this issue has been raised here: https://askubuntu.com/q/1423156/57751
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27.24
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 20.04
  InstallationDate: Installed on 2020-04-25 (859 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: ubuntu-release-upgrader (not installed)
  ProcVersionSignature: Ubuntu 5.15.0-46.49~20.04.1-generic 5.15.39
  Tags:  focal dist-upgrade
  Uname: Linux 5.15.0-46-generic x86_64
  UpgradeStatus: Upgraded to focal on 2022-08-31 (1 days ago)
  UserGroups: adm cdrom dip docker lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True

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