Hi,
I just did an update, upgrade, dist-upgrade on my 14.04 dup HDD.
I haven't done anything on 14.04 for about a month. (Hey, it's summer, it's hot and it's beer, bikini and boating season!)
I did not have anything populated under Media (off my NAS) for about 20 minutes. UpdateMedia is still running and running.
Webadmin for NAS file server views shows nothing populated under UUID (same as 12.04).
I did not have to check online box.
Did you upgrade from 10.04? If so you need to have username/password on your NAS because of changes to enhanced security in 12.04.
I wasted a lot of time running down symbolic link errors because I did not have password protection on 10.04 for my NAS when I upgraded to 12.04 (hence 14.04).
Cheers