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I'm running Ubuntu 12.10 (my system info reads "Ubuntu 13.04", though, for some reason).

Right clicking on the Desktop and then changing the background there doesnt work and just sends me to System Settings. I installed Wallach to change the background, but I'd prefer a "proper" solution.

What am I doing wrong, or how can I fix this?

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Are you sure you're running 12.10? There is no reason for 12.10 to read 13.04 ever, and if you are running 13.04, this may well be a bug related to Ubuntu+1, which is inappropriate here. – user98085 Feb 5 '13 at 21:43

First of all, if it shows Ubuntu 13.04 you're using a non-stable version of Ubuntu, what you shouldn't be doing if this is your work machine because this versions can contain bugs.

Furthermore, in System Settings there is the option Appearance, where you can change the background for an image in a set of standard images or for an image in your computer.

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in system settinings I dont have Appearance options and about 13.04 i dont know when it update to this, I know it unstable and maybe its a problem... How can i downgrade ubuntu and save all stuff? – alienowo Feb 5 '13 at 20:29
I've seen this "13.04" report from other users as well recently. Seems innocent and just a minor bug. – gertvdijk Feb 5 '13 at 21:14
You could try sudo apt get update en after that sudo do-release-upgrade – Joren Jul 11 '13 at 14:58

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