BackTrack 5 R3 KDE 32 Update 12.04 Issue

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http://www.backtrack-linux.org – I have fresh installation of BackTrack 5 R3 KDE 32 on VMware 8. When I was prompted if I want to upgrade Kubuntu to 12.04, and pressed OK. After downloading packages, trough install I had endless Errors and prompts asking if I would like to keep an old version of package or install new. In the end I found, that BT is kinda replaced with Ubuntu 12.04. So, the question is: How could i update BT5 R5 KDE-32 without this bummer? Should I use Code: su apt-get update instead? Thank you! P.S. Sorry for if my question isn't 100% correct, I'm new at this forum. :o (HowTos)