Thanks for the bug report. That screenshot appears to show a custom theme, which is where the login button is meant to be defined. You need to report this bug to the creator of the theme you are using.
** Package changed: gdm3 (Ubuntu) => ubuntu ** Changed in: ubuntu Status: New => Invalid -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gdm3 in Ubuntu. https://bugs.launchpad.net/bugs/1934589 Title: No log in button Status in Ubuntu: Invalid Bug description: Can't believe You did it on purpose so reporting it as a bug. There is no log in button after entering the password on the login screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1934589/+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