Same problem here in an openldap environment with ubuntu 14.04.3
workstations. We have this issue with adding certain openldap groups to
the local sudo group.
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Same issue here on multiple dell latitudes E6540 laptops in company
(using Ubuntu 14.04.5). And it does happen after resuming from a
suspend. Almost every open application is affected with
distorted/missing letters. Looks like
http://askubuntu.com/questions/584922/how-do-i-fix-fonts-not-rendering-
