I have found a solution that at least worked for me. I do not claim that this is the absolute end-solution for this problem and it would like Timo to have a look on it to confirm that this is the way to go.
As I mentioned above is the guest user working without any problems. What differs between my not working user and the guest user might cause the problem. So I started comparing and found that ~/.cache/compizconfig-1/core.pb is only 82 bytes while the same file for guest contains 4237 bytes. My original core.pb is nearly empty. What I did was the following: - first make a backup of ~/.cache/compizconfig-1/core.pb You can now always revert the change - su root - copy core.pb to your own home dir to ~/.cache/compizconfig-1/core.pb - chmod the file to your user - reboot All went working again. I can use the unity launcher again. Perfect! It is clear to me that is not the entire solution. The file might have been corrupted by an update and might be corrupted again. So the fix needs to correct the damaging part and also load the correct config. At least I have found a temporary solution and I'm very happy with it because I can use my computer again. I was forced to use Windows and that was no fun. Cheers, Mark -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1735594 Title: [regression] compiz crashes after Mesa upgrade Status in mesa package in Ubuntu: Fix Released Status in mesa source package in Xenial: Fix Released Status in mesa source package in Artful: Fix Released Bug description: [Impact] When I use the Unity session I automatically get logged out under these conditions: When I hover with my mouse over any icon of the sidebar. When I press the alt key. When I press the super key. running dmesg after this unwanted logout happens I get following information: compiz[10616]: segfault at 0 ip 00007fbca309feeb sp 00007fff5f59a4d0 error 4 in i965_dri.so[7fbca2af6000+7e4000] This is caused by a mesa upgrade, which added a patch for bug #1727401. The crasher is reproduced on: - gen4 / gen5 Intel - if using modesetting X driver, like when xserver-xorg-video-intel is not installed, or the HWE stack is installed (xserver-xorg-core-hwe-16.04 defaults to modesetting) [Test case] Log in to Unity, open the dash or try to log out etc. Compiz shouldn't crash. [Regression potential] The backported patches need to be tested, here for regressions and on 1727401 that they fix the original bug (again). Best to test on a wide array of Intel HW: gen4 (965GM/GM45/G45) gen5 (Ironlake) gen6 (Sandy Bridge) gen7 (Bay Trail, Ivy Bridge, Haswell) gen8 (Braswell, Broadwell) gen9 (Apollo Lake, Skylake, Gemini Lake, Kaby Lake, Coffee Lake) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1735594/+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