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

[Nick Rosbrook]

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1988299

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:
  Incomplete

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 22.04 (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

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