I check to add Backtrack 4 repository on my ubuntu lucid lynx 10.04 LTS installation to add some tools that come with Backtrack 4 easily ...
Various websites talk about it but none work ...
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Haven't tested it but this should work:
Edit: I think this would work but it appears to be 32bit-only at this juncture. There may be another repo that caters for 64bit but I can't find it.
Edit 2: This works perfectly on a 32bit version of Ubuntu.