Same problem on my machine, was caused via a .jpg file that contained HTML.
Easy way to trace the trouble causing file: % strace -o /tmp/log gnome-appearance-properties One of the last few lines will point out the filename. -- gnome-appearance-properties crashed with SIGSEGV in gnome_bg_create_thumbnail() https://bugs.launchpad.net/bugs/200106 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs