The bug is fixed for me by installing xserver-common and xserver-xorg-
core version 2:1.18.4-0ubuntu0.8 from xenial-proposed. I will continue
to run this version and watch for problems, but it seems good so far.
In aptitude, I see that xserver-xorg-core suggests xfonts-100dpi |
xfonts-75dpi (UNSATISFIED) so maybe a packaging issue there.
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Recent libgl-mesa graphics update prevents drop down list menu
appearing in apps like firefox three line/bar menu icon
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