Just a quick note: if you’re running a 64-bit install of MrBayes in parallel, you will probably need to use this page to apply some patches to the source code:
I was having problems getting MrBayes to work on a workstation running 64-bit Ubuntu, but once I started fresh and first applied those patches, things seemed to work without throwing a ‘segmentation fault’ error during the ‘sump’ function.
Palaeontology 2.0 