Comment 19 for bug 186058

First, have a look at this to add the hardy repository for debug packages:
https://wiki.ubuntu.com/DebuggingProgramCrash

After adding the repository, in synaptic hit "reload", and search for "compiz". When you see the results, for each already installed package there, install the corresponding -dbgsym package if there is one.

Then restart compiz before getting a backtrace.