I have been unable to reproduce this, this may be because the issue has been fixed in 2015.1.1. Please see if the latest keystone package resolved this issue for you.
** Changed in: keystone (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to keystone in Ubuntu. https://bugs.launchpad.net/bugs/1456305 Title: package keystone 1:2015.1.0-0ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/keystone/+bug/1456305/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs