*** This bug is a duplicate of bug 1482844 *** https://bugs.launchpad.net/bugs/1482844
python3-xlib_0.14+20091101-5_all.deb doesn't fix the issue too: Traceback (most recent call last): File "/usr/bin/caffeine", line 36, in <module> ewmh = EWMH() File "/usr/lib/python3/dist-packages/ewmh.py", line 50, in __init__ self.display = _display or display.Display() File "/usr/lib/python3/dist-packages/Xlib/display.py", line 80, in __init__ self.display = _BaseDisplay(display) File "/usr/lib/python3/dist-packages/Xlib/display.py", line 62, in __init__ display.Display.__init__(*(self, ) + args, **keys) File "/usr/lib/python3/dist-packages/Xlib/protocol/display.py", line 129, in __init__ raise error.DisplayConnectionError(self.display_name, r.reason) Xlib.error.DisplayConnectionError: Can't connect to display ":0": b'Invalid MIT-MAGIC-COOKIE-1 key' -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1460226 Title: Caffeine can't connect to display since Ubuntu 15.04 upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/caffeine/+bug/1460226/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs