Unity became totally unresponsive

[Andrey Gelman]

Clicking any icon on Unity bar leads to nothing.
The same about clicking icons in the top menu (I mean 'the network status', 'audio controls' etc.).
Global menu does not appear.
HUD activation (press Alt-key) pops the prompt on the top, but nothing can be typed in. Press Alt again, and HUD prompt will disappear.
Generally, everything works well, just no Unity ...
I am able to switch applications with Alt-Tab, type in this bug report ...
Using keyboard shortcuts to switch applications (Windows-key + Number to activate unity bar icon) also works.
--
I don't know how to reproduce it.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.18.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-37.58-generic 3.2.35
Uname: Linux 3.2.0-37-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,grid,mousepoll,regex,vpswitch,snap,gnomecompat,place,wall,move,resize,imgpng,animation,expo,session,workarounds,ezoom,staticswitcher,fade,scale,unityshell]
Date: Sun Feb 17 14:25:59 2013
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
MarkForUpload: True
SourcePackage: unity
UpgradeStatus: Upgraded to precise on 2013-01-01 (46 days ago)

[David Watne (dwatne10)]

Did not encounter this bug but I would suggest backing up whatever data you need and trying a fresh install of Ubnutu.
Don't know if that would fix it or not but that is something I would try.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.