[Bug 2034986] Re: some text became unreadable during a distribution upgrade

[Gunnar Hjalmarsson]

Hopefully an ubuntu-release-upgrader workaround will be in place soon.

But in a sense this is an ubuntu-meta matter as well. The code in my
merge proposal sets the "Sans" font temporarily, which in lunar means
that either DejaVu Sans or Noto Sans will be used in the UI during the
upgrade (unless the user has configured fontconfig to use some other
font...). And that is fine in lunar, since DejaVu Sans is always
present, and neither DejaVu Sans nor Noto Sans were changed during the
mantic cycle.

But one of the changes in mantic is that no font is safely present (i.e.
the default ones are "Recommends:" only). So later, when people will
upgrade from 23.10 to 24.04, just using "Sans" temporarily may not be
the best option. And changing it to a specific font family is tricky,
since we don't know if the user has uninstalled some of the default font
packages.

So my thought is: Can this be a reason to let desktop-common depend on,
and not only recommend, some font package after all? And if so, which
package would be suitable for the purpose?

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https://bugs.launchpad.net/bugs/2034986

Title:
  some text became unreadable during a distribution upgrade

Status in ubuntu-meta package in Ubuntu:
  Confirmed
Status in ubuntu-release-upgrader package in Ubuntu:
  In Progress
Status in ubuntu-meta source package in Mantic:
  Confirmed
Status in ubuntu-release-upgrader source package in Mantic:
  In Progress

Bug description:
  I was upgrading from Lunar to Mantic the other day and left a couple
  of applications open during the upgrade process. During the upgrade
  the text in audacious became unreadable (I'll attach a screenshot) and
  I seem to recall the title bar of Firefox being unreadable but the
  contents of web pages still being readable.

  ProblemType: Bug
  DistroRelease: Ubuntu 23.10
  Package: ubuntu-release-upgrader-core 1:23.10.5
  ProcVersionSignature: Ubuntu 6.5.0-4.4-generic 6.5.0
  Uname: Linux 6.5.0-4-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia zfs
  ApportVersion: 2.27.0-0ubuntu2
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Sep  8 15:39:27 2023
  InstallationDate: Installed on 2018-08-10 (1855 days ago)
  InstallationMedia: Ubuntu-Server 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to mantic on 2023-09-06 (2 days ago)
  VarLogDistupgradeAptclonesystemstate.tar.gz: Error: command ['pkexec', 'cat', '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'] failed with exit code 126: Error executing command as another user: Request dismissed
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update-manager.meta-release: 2021-05-27T16:30:16.970490

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