Comment 2 for bug 824231

I figured out the whole problem with this... and someone may have already known the problem, but here is the solution...
/usr/share/applications/
is missing the lmms.desktop file
If someone has the same problem have them open the terminal type
gksu gedit

then add this

[Desktop Entry]
Encoding=UTF-8
Name=LMMS
Comment=Drum sequencer with multiple plugin and midi capabilities
Exec=lmms
Terminal=false
Type=Application
Categories=Application;AudioVideo;Audio
Icon=lmms

and save as

lmms.desktop

Whoever is moderating this, please get this file where it needs to go if it is possible. Thanks