[Bug 1993184] Re: Error messages lost with "do-release-upgrade --frontend=DistUpgradeViewNonInteractive"

[R. Diez]

That is true. In my case:

/var/log/dist-upgrade/20221017-1043/main.log

2022-10-17 10:42:19,766 ERROR Not enough free space: ['/boot']
2022-10-17 10:42:19,767 ERROR Not enough free disk space The upgrade has aborted. The upgrade needs a total of 426 M free space on disk '/boot'. Please free at least an additional 34,0 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. (None)

But this is not really user friendly. Such errors should also be output
to the console (stderr). Otherwise, it's head-scratching time.

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https://bugs.launchpad.net/bugs/1993184

Title:
  Error messages lost with "do-release-upgrade
  --frontend=DistUpgradeViewNonInteractive"

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

Bug description:
  I just tried to upgrade my Ubuntu 20.04.5 to 22.04.1 with:

  do-release-upgrade --frontend=DistUpgradeViewNonInteractive

  I wanted a non-interactive upgrade because the repeated prompting
  makes the process take a long time (I wasn't looking at the terminal
  the whole time).

  The non-interactive upgrade failed straight away. The reason was that
  there was not enough space in the /boot partition/mountpoint, so I had
  to manually remove some older Linux kernels (not so intuitive).

  The problem with the command above is that the error message about the
  lack of enough disk space under /boot was not shown. Apparently, the
  DistUpgradeViewNonInteractive frontend hides such error messages.
  There wasn't even an indication of an error, the upgrade processs just
  stopped. I saw the error message when I ran "do-release-upgrade"
  without the --frontend argument.

  Option "--frontend=DistUpgradeViewNonInteractive" should not interfere
  with such error messages.

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