Software center crashes, Synaptic and Update manager don't work

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http://askubuntu.com – I really need help, I can't update or install anything. I've been searching for answers for my problem for a lot of hours and see that many have had the same problem, or at least a part of it. I've tried all the answers that the other posts got and nothing worked so I see no other option than posting a question myself. If someone feel like this question should be closed, can you please tell me where to post it instead in order to get help. (I have Ubuntu 12.04) Problem: When I try to open the Ubuntu Software Center it crashes after 3 seconds, and it has been doing so for a long time. When (HowTos)