Comment 20 for bug 1662244

Upgrading to (K)Ubuntu 18.04.5 LTS basically broke the system as X was not restarting correctly (black screen instead of lightdm display or even infinite loop of X crashes based on BIOS/EFI config).

This is critical for non-savvy users as my parents.

The issue is the same as can be seen in /var/log/lightdm/seat0-greeter.log with repeated messages like

**MEMORY-ERROR***: unity-greeter[1647]: GSlice: failed to allocate 2040 bytes (alignment: 2048)...
**MEMORY-ERROR***: unity-greeter[1647]: GSlice: failed to allocate 2040 bytes (alignment: 2048)...
**MEMORY-ERROR***: unity-greeter[1647]: GSlice: failed to allocate 2040 bytes (alignment: 2048)...

The workaround is indded updating the memlock limits as described above (adding the 2 lines of the above comment to /etc/security/limits.con).

Thanks for the workaround :)