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First make sure that the module memchache is installed through the command dpkg -l | grep python-memcache, then also check what driver have been mentioned in the keystone.conf file.

The error

ImportError: No module named memchache

indicates that you have mispelled the driver name in the conf file

The correct is driver = keystone.contrib.revoke.backends.memcache.Revoke. May be there is a typing mistake in your keystone conf file.