I'm running Ubuntu 12.04 x86. Once I had two monitors and used the Nvidia control panel to configure dual screen to get a single desktop stretched across the two monitors.
Then I had one monitor removed and now every time I login I get the following error mesage:
How do I get rid of it?
I was not able to find the cause, but I solved the issue by setting the "Launcher placement" to "laptop" under "display settings".