When I try to start Rhythmbox its window remains only for few seconds then it disappears and I get "An internal Ubuntu error" message. Even if I try to open an MP3 file I see the same scenario.
Tried to reinstall it (twice :D)
Started from command line:
(rhythmbox:9164): Gtk-CRITICAL **: gtk_css_provider_load_from_path: assertion 'path != NULL' failed
(rhythmbox:9164): GLib-GObject-CRITICAL **: object SoupServer 0x2afc3e0 finalized while still in-construction
(rhythmbox:9164): GLib-GObject-CRITICAL **: Custom constructor for class SoupServer returned NULL (which is invalid). Please use GInitable instead.
Unable to open ~/.mtpz-data for reading, MTPZ disabled.Segmentation fault (core dumped)
UPDATE
Just found a bug report to launchpad: https://bugs.launchpad.net/ubuntu/+source/rhythmbox/+bug/1299245 , but the problem does not seem to be fixed
Best Answer
Trouble-shooting
Trouble-shooting rhythmbox issues can be a bit of a trial and error.
These are the areas you should consider.
Cleaning up plugins settings
Sometimes a rogue plugin (internal or external) could be the cause of rhythmbox crashes.
Cleaning up the gsettings database for the various plugins can work:
Cleaning up locally installed plugins
Occasionally, compilation issues occur if you install external plugins manually - removing these plugins and reinstalling will resolve this.
Cleaning up all rhythmbox settings
Occasionally, a corruption can occur in other rhythmbox settings. Using Dima's answer here will resolve this.
last resort
If the above does not work then the problem is likely to be due to corruption in the rhythmbox database and related files itself. Using Alvin's answer here will resolve this.
Note though - if you use the last resort method you'll need to reimport/re-do all of your music/playlists/ratings again.