gnome-control-center does not accept too short/simple passwords. Did you try a longer one and/or mixing letters, digits and other characters?
** Changed in: gnome-control-center (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1759537 Title: Adding a user with a preset password do not work Status in gnome-control-center package in Ubuntu: Incomplete Bug description: Reproduce: - Open Settings > Details > Users - Click "Unlock" and authenticate - Click "Add User" - Enter a name/username - Select the checkbox "Set a password now" and enter a password Observe that the Add-button is now "greyed" out and cannot be clicked. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1759537/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp