[Bug 2036453] Re: Fonts messed up at upgrade from 23.04 to 23.10

[Gunnar Hjalmarsson]

Repeated the same steps, but this time using virtualbox 7.0.10-dfsg-3
hosted on mantic. The issue was reproduced.

So it wasn't a one-time glitch, and even if I haven't tried a normal
install (yet), this seems important enough to look at soon. Testing
dist-upgrades using VirtualBox should be possible.

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => High

** Changed in: update-manager (Ubuntu)
   Importance: Undecided => High

** Tags added: rls-mm-incoming

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https://bugs.launchpad.net/bugs/2036453

Title:
  Fonts messed up at upgrade from 23.04 to 23.10

Status in ubuntu-release-upgrader package in Ubuntu:
  New
Status in update-manager package in Ubuntu:
  New

Bug description:
  I performed these steps:

  * Installed Ubuntu 23.04 in a VirtualHost VM hosted on jammy
  * Logged in and updated the packages
  * Rebooted
  * update-manager -d

  During the installation process the font rendering in the UI became a
  mess, as shown in the attached screenshot.

  As a side note I can mention that the upgrade did not complete, but it
  froze at the end of the installation phase. While I could successfully
  reboot, I never got a chance to do what I really wanted to do, i.e.
  studying to which extent no longer needed font packages were
  uninstalled during the "Cleaning up" phase.

  There have indeed been font changes in 23.10, and I'm guilty of some
  of those. But I doubt that those fonts changes themselves caused the
  rendering issue:

  * The no longer needed font packages were still installed when it happened.
  * It's the Ubuntu font which is used in the GUI, isn't it, and AFAIK the big changes to that font happened before the 23.04 release.

  OTOH fontconfig has been updated during the mantic cycle (upstream
  changed from 2.14.1 to 2.14.2).

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