Ubuntu Wiki

If you find an issue with Unity, here are some guidelines for filing bugs and providing details to the development team

Where to file bugs?

You should file bugs against Unity in Launchpad.

How to produce record a backtrace?

$ DISPLAY=:0 gdb mutter
GNU gdb (GDB) 7.2-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/mutter...(no debugging symbols found)...done.
(gdb) set args --replace
(gdb) set logging file 'mutter.log'
(gdb) run

[ and when mutter crashes, do...]

(gdb) bt

[ then CTRL-D or re-run mutter to continue working ]

(gdb) run