[ubuntu] Used FoxTester's Make Default and now can't launch Firefox.

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http://ubuntuforums.org – I was using Firefox 3.6.8 and I installed FoxTester for the Firefox 4.0 beta. After a while, I saw in the FoxTester Menu that there was a Make Default option. I used it and now Firefox doesn't work at all! I tried uninstalling and reinstalling but it said that there was a error when installing. I am now using the chromium browser. This is what it gives me when it stops installing. update-alternatives: error: alternative path /usr/bin/firefox doesn't exist. dpkg: error processing firefox (--configure): subprocess installed post-installation script returned error exit status 2 Errors were enc (HowTos)