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'
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https://bugs.launchpad.net/bugs/1482844
Title:
Caffeine can't connect to display since updating Trusty to Vivid
kernel and X (HWE)
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