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It worked! I had to re-install TeXworks first, but it works just great. Problem solved. Thank you, guys, thank you very much.

Thanks for your quick responses, guys!

And yes, you're right, I installed TeXlive twice.

I first used my old DVD of Texlive 2011, but tlmgr wouldn't let me update it. So I downloaded the lastest ISO and re-installed (2012 that time). I didn't bother de-install the old one first. Turns out that was ...

Hello, I've been using TeXworks for a while, it was running well on my old system (Ubuntu 10.04). Recently, I updated to 12.04, and had to re-install Texlive and all, using the latest DVD, and then updating it via tlmgr.

Then I installed TeXworks, but it won't work correctly. When I try to compile ...