Kind of workaround until this annoying bug will be fixed. This is for thouse who has this problem with multiple accounts.
1. Logout from all accounts or reboot the computer. 2. Login to first account. 3. Click the gear icon near clock in top-left corner of top bar, select second account in menu and login. Never use the gear icon menu to change account again or you will get 'Authentication failure' error after next desktop locking. Just switch between accounts pressing Ctrl-Alt-F7 and Ctrl-Alt-F8. You can lock the desktops with Ctrl-Alt-L or Win-L as usual. Can you confirm that it works? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1733557 Title: Login screen showing Authentication Failure Switch to greeter... To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1733557/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
