There is a thread on Ubuntu's launchpad detaining problems with sync-ui on AMD64 using Ubuntu 9.10. https://bugs.launchpad.net/ubuntu/+source/syncevolution/+bug/447150 After some reading here, I've added the syncevolution repositories and installed some dbg versions of libraries; aptitude said I have the latest version of sync-ui and syncevolution after trying both these repositories. deb http://downloads.syncevolution.org/apt stable main deb http://downloads.syncevolution.org/apt unstable main Here's my latest backtrace run under gdb. $ gdb sync-ui ... (gdb) run Starting program: /usr/bin/sync-ui [Thread debugging using libthread_db enabled] Program received signal SIGSEGV, Segmentation fault. 0x00007ffff458973b in IA__g_type_name (type=<value optimized out>) at /build/buildd/glib2.0-2.22.3/gobject/gtype.c:3056 3056 /build/buildd/glib2.0-2.22.3/gobject/gtype.c: No such file or directory. in /build/buildd/glib2.0-2.22.3/gobject/gtype.c (gdb) bt #0 0x00007ffff458973b in IA__g_type_name (type=<value optimized out>) at /build/buildd/glib2.0-2.22.3/gobject/gtype.c:3056 #1 0x00007ffff4e25065 in build_specialization_name (container=<value optimized out>, num_types=14, types=0x7170c0) at dbus-gtype-specialized.c:239 #2 lookup_or_register_specialized (container=<value optimized out>, num_types=14, types=0x7170c0) at dbus-gtype-specialized.c:423 #3 0x00007ffff4e252bc in dbus_g_type_get_struct (container=0x412ec3 "GValueArray", first_type=140737488346744) at dbus-gtype-specialized.c:525 #4 0x000000000040dc62 in ?? () #5 0x00007ffff42b29eb in IA__g_ptr_array_foreach (array=0x742660, func=0x40dbb0, user_data=0x0) at /build/buildd/glib2.0-2.22.3/glib/garray.c:818 #6 0x000000000040a358 in ?? () #7 0x000000000040ee0e in ?? () #8 0x000000000040effa in ?? () #9 0x00007ffff4bdceba in ?? () from /lib/libdbus-1.so.3 #10 0x00007ffff4bdf0ff in dbus_connection_dispatch () from /lib/libdbus-1.so.3 #11 0x00007ffff4e17bd5 in message_queue_dispatch (source=<value optimized out>, callback=<value optimized out>, user_data=<value optimized out>) at dbus-gmain.c:101 #12 0x00007ffff42d8bce in g_main_dispatch (context=0x648980) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:1960 #13 IA__g_main_context_dispatch (context=0x648980) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2513 #14 0x00007ffff42dc598 in g_main_context_iterate (context=0x648980, block=<value optimized out>, dispatch=<value optimized out>, self=<value optimized out>) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2591 #15 0x00007ffff42dc9f5 in IA__g_main_loop_run (loop=0x8b3170) at /build/buildd/glib2.0-2.22.3/glib/gmain.c:2799 #16 0x00007ffff76f6177 in IA__gtk_main () at /build/buildd/gtk+2.0-2.18.3/gtk/gtkmain.c:1218 #17 0x0000000000405f8d in ?? () #18 0x00007ffff3f4cabd in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fffffffe398) at libc-start.c:220 #19 0x0000000000405e79 in ?? () #20 0x00007fffffffe398 in ?? () #21 0x000000000000001c in ?? () #22 0x0000000000000001 in ?? () #23 0x00007fffffffe653 in ?? () #24 0x0000000000000000 in ?? () I've subscribed to the digest, so please trim any replies. Thanks, Steve