I have a newer version (2.5.7.1) installed currently which doesn't crash. Try installing the 2.5.6-2 (stock Dapper's version) yourself, reproduce the segfault and you'll have the backtrace.
-- d4x segfaults after about a minute downloading from ftp https://launchpad.net/bugs/53100 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs