This issue (which did not occur with a fresh install of 16.04) appears
to be related to the contents of file:
/usr/share/themes/Ambiance/gtk-2.0/gtkrc
At line 346 (at present) there is the following:
style "menu" = "dark" {
Changing it to:
style "menu" {
... resolves this particular issue, however I'm not sure what side-
effects that would have. In the original release the line was like that
in the first place, so it would have been changed for a reason.
Screenshots of "before" and "after" that change can be seen here:
https://askubuntu.com/a/1014016/425017
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https://bugs.launchpad.net/bugs/1750973
Title:
Program sub menus dark gray on black, thus illegible
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