I've been running Kubuntu Linux for a while (Breezy, 5.10) and it has been working great. It was a little bit fiddly to get my wireless USB Adapter (MA111) working, but I haven't had any other real problems to mention.
Perhaps it was because of this that when I heard the new version of Kubuntu (Dapper, 6.06) was out I decided to upgrade straight away. The magic of apt lured me into thinking that the upgrade process was going to be simple. I fired up Adept (package manager), changed the repositories from breezy to dapper, selected 'Fetch Updates' and then 'Full Upgrade' and then 'Commit'.
Well, this is where the trouble started. Adept downloaded a bunch of packages before crashing. I restarted the machine and KDE would no longer start. Knowing a little about apt, I tried 'apt-get install', but there were dependency issues. I tried 'apt-get -f install' as suggested, rebooted and then not even the shell would start. Many segmentation faults followed.
Now I'm faced with the prospect of reinstalling Linux (yet again). My dreams of seamless upgrades and only ever installing a Linux system once are shattered. Its just fortunate my Kubuntu partition was only one of four distros on my desktop so I can still use my computer until I bite the bullet and reinstall.
I almost wish for the long release cycles of Windows... The new Dapper features better be worth it.