When trying to log in after the update to unity 5.8, the system locks up either on the login screen, or just shows the wallpaper without the panel or launcher. I can still move the mouse, but there is no response to any clicking. The only solution for me was to go to the alt+ctrl+F1 terminal and restart the system. Unity2D seems to work fine. Attached is a (hopefully helpful) log of unity during its startup.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.8.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-20.32-generic 3.2.12
Uname: Linux 3.2.0-20-generic i686
NonfreeKernelModules: openafs
ApportVersion: 1.95-0ubuntu1
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,resize,gnomecompat,snap,grid,move,compiztoolbox,wall,firepaint,imgpng,regex,animation,vpswitch,place,session,expo,workarounds,ezoom,staticswitcher,fade,scale,unityshell]
Date: Sat Mar 24 07:33:28 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110413)
SourcePackage: unity
UpgradeStatus: Upgraded to precise on 2012-03-03 (20 days ago)
Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 963633, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.