In trying to drag and drop a PNG imagine to my chrome browser window my desktop is in an hung state.
The mouse pointer is now a small hand icon. I can't click any window buttons.
How to I recover my desktop without rebooting?
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You can try reloading the mouse module:
Press Alt + F2 for command execution
gksudo modprobe -r psmouse
gksudo modprobe psmouse
If you don't need the chrome session, try killing the chrome window:
Alt + F2 again and then:
The mouse cursor should witch to an "X". Click the chrome window to kill it.
There is a bug report for this problem . In the discussion of this bug I found a solution that worked for me: