I've done some more digging around, and it now looks more likely that
the culprit is the mappings in the file:
/usr/share/X11/locale/el_GR.UTF-8/Compose
which belong to the package "libx11-data".
** Package changed: gtk+3.0 (Ubuntu) => ubuntu
** Package changed: ubuntu => libx11 (Ubuntu)
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https://bugs.launchpad.net/bugs/1025291
Title:
Compose key yields incorrectly accented Greek characters when using
Greek keymap
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