Comment 2 for bug 1081260

buntu@ubuntu:~$ gdb /usr/lib/ubiquity/wallpaper
GNU gdb (GDB) 7.5-ubuntu
Copyright (C) 2012 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/lib/ubiquity/wallpaper...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/lib/ubiquity/wallpaper
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[New Thread 0xb6a68b40 (LWP 10061)]

** (wallpaper:10057): ERROR **: First parameter must be an existing background

Program received signal SIGTRAP, Trace/breakpoint trap.
0xb78293fd in g_logv () from /lib/i386-linux-gnu/libglib-2.0.so.0
(gdb) bt
#0 0xb78293fd in g_logv () from /lib/i386-linux-gnu/libglib-2.0.so.0
#1 0xb7829583 in g_log () from /lib/i386-linux-gnu/libglib-2.0.so.0
#2 0x08048d5b in ?? ()
#3 0xb75134d3 in __libc_start_main () from /lib/i386-linux-gnu/libc.so.6
#4 0x080491bd in ?? ()