[Merge] ~gunnarhj/ubuntu-release-upgrader:temp-font into ubuntu-release-upgrader:ubuntu/main

[Gunnar Hjalmarsson]

Gunnar Hjalmarsson has proposed merging ~gunnarhj/ubuntu-release-upgrader:temp-font into ubuntu-release-upgrader:ubuntu/main.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~gunnarhj/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/451815

This is my attempt at a fix. Please note that I don't know
- how to test it live
- how I would check whether the Gtk frontend is in use (as was mentioned in the bug report)

As regards the latter, possibly it's not so important, after all. For e.g. Kubuntu, where they normally rely on fontconfig also for the desktop, the code wouldn't really change the font.
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~gunnarhj/ubuntu-release-upgrader:temp-font into ubuntu-release-upgrader:ubuntu/main.
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