The 12.04.1 system is running again thanks to the CLI tip from nickrout to apply the fix.
No errors over the last few hours. I'll report back next week with status unless I have another error beforehand.
I don't need to scan with the pvr-?50 cards. After fetching the analog channel info from Schedules Direct, the channels are ready to select.
I have never needed to mess with ivtv either.