Mine

Opera encountered a problem during plug-in setup.
Plug-ins will not work properly.
Check your installation.

Could not start plug-in executable 'operamotifwrapper'.
/usr/lib/mozilla/plugins/operamotifwrapper-3
Please install Motif.

Plug-in path
(Path can be modified in Preferences dialog)

/usr/lib/opera/plugins
/usr/lib/mozilla/plugins