Opera Error in Ubuntu Linux: operamotifwrapper plug-in

After I installed Opera on Ubuntu, I encountered the following error:

The Error

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/netscape/plugins-libc6/operamotifwrapper-3 Please install Motif. Plug-in path (Path can be modified in Preferences dialog) /usr/lib/opera/plugins /usr/lib/mozilla/plugins /usr/lib/netscape/plugins-libc6

The Solution

To fix this problem, enter this in the command line:

sudo apt-get install libmotif3