Comment # 1 on bug 953651 from Dominique Leuenberger

Probably an error in the apparmor profile: do you have apparmor enabled/loaded?

> systemctl status apparmor

if you have it enabled - could you disable it and verify if this makes the
colord error go away (that would be a clear confirmation)

WARNING: disabling apparmor and re-enabling it leaves all running process
unprotected! You'd need to restart your services or, easier, your system