Comment 4 for bug 1053292

I concur with Anne, or at least with the solution.

I had recently run software-updater under quantal (beta), and foolishly clicked on the partial upgrade option. The system no longer booted properly. tty7 was left with boot messages, but no logon prompt. I logged in under tty1 and ran

> startx&

and this gave me my desktop icons, but no unity plugin stuff (launcher & status bar). I also ran

> unity&

but this complained about no display being set (default = 0 ???), and maybe something about looking for a "core" library.

Anyways, I also had been using apt-get to update upgrade dist-upgrade no no avail. So when I ran...

> sudo apt-get purge update-manager
> sudo apt-get install update-manager

and rebooted, I was pleasantly surprised that everything was working again.