Thank you for your bug report. Could you add your 'journalctl -b 0' after the system start? When the battery gets empty the system does try to suspend or hibernate depending of your configuration so the next boot is not a standard one but a resume which could explain you don't get prompted to log in
** Package changed: gnome-screensaver (Ubuntu) => gnome-shell (Ubuntu) ** Changed in: gnome-shell (Ubuntu) Importance: Undecided => Low ** Changed in: gnome-shell (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1890261 Title: I am not prompted for my password when booting after running out of power (e.g. empty battery) Status in gnome-shell package in Ubuntu: Incomplete Bug description: Ubuntu 18.04.4 LTS When the system shuts down because of lack of power supply, the next time, I am not prompted for my password; I go directly to the desktop. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gnome-screensaver (not installed) ProcVersionSignature: Ubuntu 4.15.0-112.113-generic 4.15.18 Uname: Linux 4.15.0-112-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.15 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Tue Aug 4 11:06:26 2020 InstallationDate: Installed on 2018-10-04 (669 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) SourcePackage: gnome-screensaver Symptom: security Title: Screen locking issue UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1890261/+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