Cannot open GNOME Settings menu on some computers since Tails 3.6

Originally created by @emmapeel on #15433 (Redmine)

Some users with NVIDIA cards are reporting they are unable to open the Applications - System Tools - Settings menu since Tails 3.6.

I cannot reproduce.

01:00.0 VGA compatible controller: NVIDIA Corporation GP104 [GeForce GTX 1080] (rev a1)

Feature Branch: bugfix/15433-GNOME-settings-vs-VA-API

Edited May 15, 2020 by emmapeel

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