[Bug 2039356] [NEW] Unreadable text during distupgrade: follow-up

[Gunnar Hjalmarsson]

Public bug reported:

[ Impact ]

This bug is a follow-up of bug #2034986. Please see that bug, especially
comment #54, for a more verbose background to this bug report.

The short story:

* Ubuntu Cinnamon is hit by 'the unreadable text issue' described in the
other bug.

* Several Ubuntu flavors fail to reset the desktop font after reboot,
since they lack the systemd integration needed for a user service to
work.

The proposed changes include

* a correction of the applied gsettings schema for Ubuntu Cinnamon

* use of an autostart file instead of a systemd service for a bunch of
flavors.

[ Test Plan ]

Prepare updated 23.04 versions of Ubuntu Cinnamon and Ubuntu Desktop.

Install version 1:23.04.7 of ubuntu-release-upgrader-core (may be in
lunar-proposed)

For upgrading use: "update-manager -d -p"
(not sure if '-d' is still needed)

As regards Ubuntu Cinnamon:

* Confirm that the text is readable during the whole upgrade.

* Confirm after reboot that the command

  gsettings get org.cinnamon.desktop.interface font-name

  now outputs 'Ubuntu 11' and not the temporary 'Sans 11'.

As regards Ubuntu Desktop simply confirm that the upgrade works as
intended and that you don't notice any regression.

[ Where problems could occur ]

I might have made some mistake as regards gsettings schemas and/or
flavors which need autostart. But the code it straightforward, and I
dare to say that the _set_generic_font() function works as intended for
more flavors with the proposed changes. And if there would be a mistake
with respect to some particular flavor, it would affect that flavor
only.

[ Other Info ]

It's worth mentioning (here too) that the applied model for preventing
the readability issue at upgrade, i.e. changing a dconf value which
represents the desktop font, is not effective in the case of Kubuntu,
Lubuntu and Xubuntu. They are just not hit by the issue since the fonts
they use have not changed during the cycle.

** Affects: cinnamon-project
     Importance: Undecided
         Status: New

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: High
     Assignee: Gunnar Hjalmarsson (gunnarhj)
         Status: In Progress

** Affects: ubuntu-release-upgrader (Ubuntu Mantic)
     Importance: High
     Assignee: Gunnar Hjalmarsson (gunnarhj)
         Status: In Progress


** Tags: mantic

** Also affects: ubuntu-release-upgrader (Ubuntu Mantic)
   Importance: High
     Assignee: Gunnar Hjalmarsson (gunnarhj)
       Status: In Progress

** Also affects: cinnamon-project
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2039356

Title:
  Unreadable text during distupgrade: follow-up

Status in Cinnamon:
  New
Status in ubuntu-release-upgrader package in Ubuntu:
  In Progress
Status in ubuntu-release-upgrader source package in Mantic:
  In Progress

Bug description:
  [ Impact ]

  This bug is a follow-up of bug #2034986. Please see that bug,
  especially comment #54, for a more verbose background to this bug
  report.

  The short story:

  * Ubuntu Cinnamon is hit by 'the unreadable text issue' described in
  the other bug.

  * Several Ubuntu flavors fail to reset the desktop font after reboot,
  since they lack the systemd integration needed for a user service to
  work.

  The proposed changes include

  * a correction of the applied gsettings schema for Ubuntu Cinnamon

  * use of an autostart file instead of a systemd service for a bunch of
  flavors.

  [ Test Plan ]

  Prepare updated 23.04 versions of Ubuntu Cinnamon and Ubuntu Desktop.

  Install version 1:23.04.7 of ubuntu-release-upgrader-core (may be in
  lunar-proposed)

  For upgrading use: "update-manager -d -p"
  (not sure if '-d' is still needed)

  As regards Ubuntu Cinnamon:

  * Confirm that the text is readable during the whole upgrade.

  * Confirm after reboot that the command

    gsettings get org.cinnamon.desktop.interface font-name

    now outputs 'Ubuntu 11' and not the temporary 'Sans 11'.

  As regards Ubuntu Desktop simply confirm that the upgrade works as
  intended and that you don't notice any regression.

  [ Where problems could occur ]

  I might have made some mistake as regards gsettings schemas and/or
  flavors which need autostart. But the code it straightforward, and I
  dare to say that the _set_generic_font() function works as intended
  for more flavors with the proposed changes. And if there would be a
  mistake with respect to some particular flavor, it would affect that
  flavor only.

  [ Other Info ]

  It's worth mentioning (here too) that the applied model for preventing
  the readability issue at upgrade, i.e. changing a dconf value which
  represents the desktop font, is not effective in the case of Kubuntu,
  Lubuntu and Xubuntu. They are just not hit by the issue since the
  fonts they use have not changed during the cycle.

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