Since upgrade to KDE 4.9, digikamnepomukservice crashes too many time on startup (5 tries) and does no longer start. My problem is that I used to deal with digiKam data (tags, comments,...) in Dolphin, Gwenview, etc...
Command in terminal :
/usr/bin/nepomukserver
Messages in terminal :
........ then :
Application '/usr/bin/nepomukservicestub digikamnepomukservice' crashed! 0 restarts left.
[/usr/bin/nepomukservicestub] Failed to start service digikamnepomukservice (Le service " Service Nepomuk pour digiKam " ne fournit pas d'interface " Nepomuk2::Service " avec le mot-clé " ").
Application '/usr/bin/nepomukservicestub digikamnepomukservice' crashed too often. Giving up!
[/usr/bin/nepomukservicestub] QObject::connect: cannot connect XSyncBasedPoller::destroyed() to (null)::_k_x11FilterDestroyed()

Reproducible: Always

Steps to Reproduce:
1. Log on to Ubuntu (Precise 12.04.1) / Unity as a normal user. Check that strigidaemon and nepomukserver have correctly started with the appropriate session startup commands. You should not see 'digikamnepomukservice'.
2. Open a terminal. Kill nepomukserver. Check that no more processes related to nepomuk are running (except 'strigidaemon').
3. At the terminal prompt, enter the command '/usr/bin/nepomukserver &'. Virtuoso / Soprano start correctly, then you get messages (see above) stating that digikamnepomukservice couldn't be started.
4. Check which processes run : digikamnepomukservice is no longer there.
Actual Results:  
You loose all your digiKam metadata in Nepomuk

Expected Results:  
Make all digiKam metadata available to Nepomuk, Dolphin, Gwenview....