Can you please check if you are running Unity or Unity-2d: try running "ps -fe | grep unity" and paste the result here.
Also, what version of unity are you running (dpkg -l "unity-2d-places")?
Another user also reported this issue; I'm marking this bug as duplicate, then.
There's no need to provide the information I asked for, because it's already there in the other bug. Thanks anyway! :-)
Alex, thanks for reporting this bug.
Can you please check if you are running Unity or Unity-2d: try running "ps -fe | grep unity" and paste the result here.
Also, what version of unity are you running (dpkg -l "unity-2d-places")?