The problem seems to have gone away since I installed Linux Mint.
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https://bugs.launchpad.net/bugs/821795
Title:
Tablet frequently stops working in the GIMP until mouse
Public bug reported:
Recently, I noticed the GIMP refused to recognise tablet input for the
top level menus from the menu bar associated with an image, though
deeper level dialogue boxes often remain functional. (I have use the
keyboard to summon them). I purged and reinstalled the GIMP to no avai