Run gsettings get org.gnome.desktop.input-sources xkb-options. If you
see more than one list item that begins with grp:, that might be it.
Use gsettings set to remove all of them except one (or just all of
them).
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Desktop
I was still affected by this bug because of this bug:
https://bugzilla.gnome.org/show_bug.cgi?id=726649. I worked around it
by removing one of my xkb grp options. Ubuntu developers might want to
backport the patch from that bug, though.
** Bug watch added: GNOME Bug Tracker #726649