Попробуйте запустить через Терминал gnome-control-center
и посмотрите, на что ругается.
segfault
$ gdb gnome-control-center
(gdb) r
Starting program: /usr/bin/gnome-control-center
[Thread debugging using libthread_db enabled]
[New Thread 0xb67afb70 (LWP 1960)]
[New Thread 0xb5f6ab70 (LWP 1961)]
** (gnome-control-center:1957): WARNING **:
error raised: [libslab_get_gconf_value: error getting /desktop/gnome/applications/main-menu/lock-down/user_modifiable_apps]
** (gnome-control-center:1957): WARNING **:
error raised: [load_xbel_store: couldn't load bookmark file [NULL]
]
Program received signal SIGSEGV, Segmentation fault.
0xb78999b6 in g_markup_escape_text () from /lib/i386-linux-gnu/libglib-2.0.so.0