I had the same problem after updating today my desktop (Zotac CI-320) on 14.04 LTS
carlos@nano:~$ uname -a Linux nano 3.16.0-48-generic #64~14.04.1-Ubuntu SMP Thu Aug 20 23:03:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux [Dom Out 25 11:35:57 2015] compiz[3061]: segfault at b0 ip 00007f1abf950a0f sp 00007fff24ca26e0 error 4 in libnux-graphics-4.0.so.0.6.0[7f1abf904000+cb000] [Dom Out 25 11:36:28 2015] compiz[4050]: segfault at b0 ip 00007f579752ca0f sp 00007fffc7a408d0 error 4 in libnux-graphics-4.0.so.0.6.0[7f57974e0000+cb000] [Dom Out 25 11:37:05 2015] compiz[5022]: segfault at b0 ip 00007f1dcc5d6a0f sp 00007fff4c6236b0 error 4 in libnux-graphics-4.0.so.0.6.0[7f1dcc58a000+cb000] -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to nux in Ubuntu. https://bugs.launchpad.net/bugs/1311503 Title: compiz crashes with segfault error in libnux-graphics Status in Nux: Invalid Status in nux package in Ubuntu: Invalid Bug description: When I login compiz crashes with a segfault error in libnux-graphics. My screen turns blue (with nouveau driver) or with white blocks (nvidia current driver). In dmesg the following messages are shown: [ 808.965220] compiz[7568]: segfault at b0 ip 00007f9246244a0f sp 00007fff0a7a1450 error 4 in libnux-graphics-4.0.so.0.6.0[7f92461f8000+cb000] [ 813.851368] compiz[7722]: segfault at b0 ip 00007f34215bca0f sp 00007fffe2e356d0 error 4 in libnux-graphics-4.0.so.0.6.0[7f3421570000+cb000] I only get this error with my Nvidia GTX 460 card. I do not get these errors with my radeon and intel video cards (my other pc and laptop). All running latest Trusty 14.04. To manage notifications about this bug go to: https://bugs.launchpad.net/nux/+bug/1311503/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp