A syntax error is inside one of the keymap files.
In this case it is inside the '/usr/share/X11/xkb/symbols/by' file:
<TLDE> { [ Cyrillic_io, Cyrillic_IO apostrophe, asciitilde ] };)
There is no comma between 'Cyrillic_IO' and 'apostrophe'. It was made by
my mistake, but this leads to the error message displayed which is not
helpful for diagnosting the cause of the issue.
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Xorg, GNOME: Keyboard Preferences displays non user-friendly erorr
https://bugs.launchpad.net/bugs/558348
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