Comment 7 for bug 1785622

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Richard Lamont (richard-lamont) wrote :

I've seen a couple of other applications which produce the message: Failed to load module "topmenu-gtk-module"

This appears to be a problem with dist-upgrading ubuntu-mate-default-settings from 16.04 to 18.04. The upgrade installs /etc/X11/Xsession.d/80mate-environment but does not remove the older /etc/X11/Xsession.d/99mate-environment. Deleting the latter fixed the problem.