Small bugs?
Small? This is some new definition of the word "small" to which I was not previously privy.
I dropped the RC on to a non-essential laptop (stupid, I know, I should have used a virtualised box) anyway...the install worked. Then rebooted. Then hung. Then rebooted.
The login screen it fugly (seems to have got confused about the theme).
The "Login Window" entry appears to have vanished, so fixing the above will be non-trivial to the average user (command line and "gksu /usr/sbin/gdmsetup" is non-obvious).
Fast user switch panel is dead.
Desktop is broken (no wallpapper, no icons, no conky, but they briefly appear on logout - just a black background when logged in)
Cron is dead.
Firefox is dead.
Pulseaudio is dead.
I'll grant you that the first three are small, fourth is medium but the last three are huge. I didn't have time to test anything else, nor log bugs (I'll be doing that as soon as I get a chance). I hope the final release can correct these issues, either that or it's flatten and re-install time.
I may try the RC again in a virtual machine after taking a snapshot, but I will say one thing; unless you are technical expert (and if you are running Ubuntu, you are probably not) DO NOT install the release candidate. Once again Linux (this time in the guise of Canonical) shows that it is not ready for the average user.
Oh, and before the morons start slagging. The "average user" thinks Facebook is the internet. M'kay? They don't care about how their PC works and, to a large extent, nor should they.