[Bug 2027847] Re: Bump minimum /boot size in ubuntu-release-upgrader

[Julian Andres Klode]

Right so it seems we forgot to bump the size requirements in ubuntu-
release-upgrader when bumping them in the installer in bug 1959971, you
probably should not have been able to upgrade. Albeit the size it seems
is determined from the initramfs that is in /boot.

We also don't seem to acccount for system.map which is about 10MB per
kernel

Unfortunately there isn't much else we can do here. You can of course
opt to

1) set MODULES=dep in /etc/initramfs-tools/initramfs.conf - this will
mean that you can't replace your mainboard or swap your disk into a
different machine as the initrd will only include modules relevant to
the device the system is running on

2) specify COMPRESS=xz or preferably if available a higher
COMPRESSLEVEL=1 in the same file such that compression is higher.

I don't know why your initramfs are that big, presumably you are using
nvidia gpus? With 3 kernels on my /boot and no out-of-kernel drivers I
use 438MB.

** Tags added: rls-ll-incoming

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https://bugs.launchpad.net/bugs/2027847

Title:
  Bump minimum /boot size in ubuntu-release-upgrader

Status in apt package in Ubuntu:
  Won't Fix
Status in dpkg package in Ubuntu:
  Invalid
Status in kernel-package package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Invalid
Status in linux-firmware package in Ubuntu:
  Invalid
Status in linux-kernel-headers package in Ubuntu:
  Invalid
Status in linux-restricted-modules package in Ubuntu:
  Invalid
Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  System information:
  ubuntu 23.04 x86_64
  6.2.0-24-generic

  Upgrading the system:

  $ sudo dpkg --configure -a
  Setting up linux-firmware (20230323.gitbcdcfbcf-0ubuntu1.2) ...
  update-initramfs: Generating /boot/initrd.img-6.2.0-24-generic
  I: The initramfs will attempt to resume from /dev/dm-2
  I: (/dev/mapper/ubuntu--vg-swap_1)
  I: Set the RESUME variable to override this.
  zstd: error 70 : Write error : cannot write block : No space left on device 
  E: mkinitramfs failure zstd -q -1 -T0 70

  Check space left (none):
  $ df -h /boot
  Filesystem      Size  Used Avail Use% Mounted on
  /dev/sdb2       707M  693M     0 100% /boot

  What is required is to remove older kernels (and purge them most likely). List all the installed kernels except the current one:
  $ dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d'
  linux-headers-6.2.0-23
  linux-headers-6.2.0-23-generic
  linux-headers-6.2.0-25
  linux-headers-6.2.0-25-generic
  linux-image-6.2.0-23-generic
  linux-libc-dev:amd64
  linux-libc-dev:i386
  linux-modules-6.2.0-23-generic
  linux-modules-6.2.0-25-generic
  linux-modules-extra-6.2.0-23-generic
  linux-modules-extra-6.2.0-25-generic

  Is not possible to uninstall any kernel because fails:
  $ sudo apt purge linux-headers-6.2.0-23
  E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.

  Reconfigure fails again so some kernel have to be manually removed to free up space:
  $ sudo rm /boot/initrd.img-6.2.0-23-generic
  $ sudo rm -rf /boot/initrd.img-6.2.0-25-generic.new

  Now you can reconfigure:
  $ 

  Remove kernels:
  $ sudo apt purge linux-headers-6.2.0-23 linux-headers-6.2.0-23-generic linux-headers-6.2.0-25 linux-headers-6.2.0-25-generic linux-image-6.2.0-23-generic linux-modules-6.2.0-23-generic linux-modules-6.2.0-25-generic linux-modules-extra-6.2.0-23-generic linux-modules-extra-6.2.0-25-generic

  Reboot:
  $ sudo reboot

  Upgrade as usual:
  $ sudo apt update && sudo apt upgrade

  Before upgrading new kernels I need to check for free space and remove
  older kernels manually. Fix this so there's only one kernel left.

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