+1 on oneiric
$ gdb -batch -ex run -ex bt synapse

[Depuración de hilo usando libthread_db enabled]
[18:20:29.965057 Info] Starting up...
/home/lab1/.gtkrc-2.0:1: No se ha podido encontrar el archivo «include»: «.gtkrc-2.0-gnome-color-chooser»
[Nuevo Thread 0x7fffec656700 (LWP 3976)]
[Nuevo Thread 0x7fffebe55700 (LWP 3977)]
[Nuevo Thread 0x7fffeb229700 (LWP 3978)]
[18:20:30.180711 Info] [UILauncher] Binding activation to <Super>space
[18:20:30.180783 GtkHotkey-Debug] Listener Type: GtkHotkeyX11Listener
[18:20:30.219448 Info] [GuiViewDefault] Screen is composited.
[18:20:30.219751 Info] [GuiViewDefault] Using ibus input method.
[18:20:30.464466 Warning] [DesktopFileInfo] El archivo de claves no tiene la clave «Type»
[18:20:30.492630 Warning] [DesktopFileInfo] El archivo de claves contiene la clave «Terminal» que tiene un valor que no puede interpretarse.
[18:20:30.645127 Warning] [DesktopFileInfo] Unable to create AppInfo
[18:20:30.663973 Warning] [DesktopFileInfo] Unable to create AppInfo
[18:20:30.689658 Warning] desktop-file-service.vala:448: El archivo de claves no empieza por un grupo
[18:20:30.690849 Warning] [DesktopFileInfo] Unable to create AppInfo
[18:20:30.692565 GLib-Critical] g_regex_replace_eval: assertion `string != NULL' failed
[18:20:30.692596 Critical] string_strip: assertion `self != NULL' failed

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff52c5b30 in g_str_hash () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#0  0x00007ffff52c5b30 in g_str_hash () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007ffff79981ff in ?? () from /usr/lib/libgee.so.2
#2  0x00007ffff7998539 in ?? () from /usr/lib/libgee.so.2
#3  0x0000000000453e0e in synapse_desktop_file_service_create_indices (self=0x8fe730) at desktop-file-service.c:2802
#4  synapse_desktop_file_service_load_all_desktop_files_co (_data_=0x76a860) at desktop-file-service.c:2288
#5  0x00007ffff5a2dc17 in g_simple_async_result_complete () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#6  0x000000000045086d in synapse_desktop_file_service_load_mime_parents_from_file_co (_data_=0x772000) at desktop-file-service.c:3110
#7  0x00007ffff5a2dc17 in g_simple_async_result_complete () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#8  0x00007ffff59fc82a in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#9  0x00007ffff59fca42 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#10 0x00007ffff59f4341 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#11 0x00007ffff5a2dc17 in g_simple_async_result_complete () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#12 0x00007ffff59f468d in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#13 0x00007ffff5a1db89 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#14 0x00007ffff5a2dc17 in g_simple_async_result_complete () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#15 0x00007ffff5a2dca8 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#16 0x00007ffff52a5a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007ffff52a6258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007ffff52a6792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007ffff6c33db7 in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#20 0x0000000000414b63 in synapse_ui_launcher_main (argv=0x7fffffffe238, argv_length1=1) at synapse-main.c:1035
#21 0x00007ffff4cc430d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#22 0x0000000000413789 in _start ()