Login for accounts with no password is too sticky

[Mainely Web]

Linux Mint Petra Cinnamon
mdm 1.4.7+petra
Mint-X login screen

When there is a user account without a password along with others using passwords, the account without a password can take over the login process and prevent logging in to the other accounts.

In the login screen, if you click on or scroll to the account which has no password set, you log in instantly to that account. The problem comes in when you log out or restart the computer. Since mdm automatically selects the last user upon return to the login screen, you are instantly logged right back in to the account with no password.

A partial quick fix is to kill mdm, log in as an administrator and uncheck the "Automatically select the last logged in user" entry in the Login Window Preferences.

This, however does not fix a related problem where you are logged in to the passwordless account if you try to scroll through the list of user accounts in the login screen. As soon as you hit the account without the password, you are logged in without the opportunity to scroll past to another account.

Also posted to github as https://github.com/linuxmint/mdm/issues/65

[kggy (kovacs-g-gy)]

I can confirm that in Mint 16 Petra Cinnamon 32 bit, with updates until 0612.2013. In addition if I try to switch user I am asked for a password for the account that does not have password. So I have to logout to "switch" users.

[Per (perwolf)]

Original "feature" still exists in Linux Mint 17,1 Cinnamon 64-bit.
kggy's problem is the same as https://bugs.launchpad.net/linuxmint/+bug/1264854

[Stas Grablevskiy (stasg)]

Problem still exists in Mint 18.1, Cinnamon 64-bit.

[Stas Grablevskiy (stasg)]

If several users exists on the system, and at least one of them has no password, then while selecting the username on logon screen with arrowkeys, the user with no password is logged in automatically when just you step on it, not press Enter. Even if you want just to pass through.