I recently built a new PC and installed Ubuntu 18.10. I am having issues with being logged out and returning to the login after opening certain Applications (Settings, Handbrake etc).

Logging in via startx and attempting to open these applications results in a similar logout with the following Xorg Error Stack Trace:

[    12.456] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x139) [0x55eeaa7b4229]
[    12.456] (EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x50) [0x7f54784ace1f]
[    12.456] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (gsignal+0xc7) [0x7f54782ef077]
[    12.456] (EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (abort+0x121) [0x7f54782d0535]
[    12.456] (EE) unw_get_proc_name failed: no unwind info found [-10]
[    12.456] (EE) 4: /lib/x86_64-linux-gnu/libc.so.6 (?+0x0) [0x7f54782d0400]
[    12.457] (EE) 5: /lib/x86_64-linux-gnu/libc.so.6 (__assert_fail+0x42) [0x7f54782e0142]
[    12.457] (EE) 6: /usr/lib/xorg/Xorg (DRIMoveBuffersHelper+0xc43) [0x55eeaa77f933]
[    12.457] (EE) 7: /usr/lib/xorg/Xorg (DRI2Authenticate+0xa2) [0x55eeaa780f42]
[    12.457] (EE) 8: /usr/lib/xorg/Xorg (DRI2GetParam+0x75b) [0x55eeaa7820cb]
[    12.457] (EE) 9: /usr/lib/xorg/Xorg (SendErrorToClient+0x35e) [0x55eeaa65597e]
[    12.457] (EE) 10: /usr/lib/xorg/Xorg (InitFonts+0x3b6) [0x55eeaa659906]
[    12.457] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xeb) [0x7f54782d209b]
[    12.457] (EE) 12: /usr/lib/xorg/Xorg (_start+0x2a) [0x55eeaa64367a]
[    12.457] (EE)
[    12.457] (EE)
Fatal server error:
[    12.457] (EE) Caught signal 6 (Aborted). Server aborting
[    12.457] (EE)
[    12.457] (EE)

it appears modifying the .Xauthority permissions from -rw------- to -rwxrwxrwx prevents the logouts from occurring temporarily. After being logged out,.Xauthority permissions are reset to -rw-------

Computer specs

Intel 9900k - Using Oboard Graphics
Asus Z390 Mobo
Samsung Pro 970
Corsair Vengeance DDR4

Any advice would be greatly appreciated


Just experienced the same problem with the 9900k and ubuntu 18.10.

Using the mesa packages available from the ppa ppa:oibaf/graphics-drivers fixed it for me:

sudo add-apt-repository ppa:oibaf/graphics-drivers
sudo apt dist-upgrade

and reboot or restart Xorg.

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