It sounds like that's expected. The fix and upstream bug report mention the problem is specific to the Shift key:
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/91 https://gitlab.gnome.org/GNOME/gnome-shell/issues/240 -- 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/1765261 Title: [regression] Ubuntu 18.04 login screen rejects a valid password on first attempt. Usually works on the second attempt Status in gnome-shell package in Ubuntu: In Progress Status in gnome-shell source package in Bionic: Confirmed Status in gnome-shell package in Fedora: Fix Released Bug description: Upstream: https://gitlab.gnome.org/GNOME/gnome-shell/issues/240 Ubuntu 18.04 login screen rejects a valid password on first attempt. Always works on the second attempt.. This seems to be a new problem, just started today. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gdm3 3.28.0-0ubuntu1 ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15 Uname: Linux 4.15.0-15-generic x86_64 ApportVersion: 2.20.9-0ubuntu5 Architecture: amd64 Date: Thu Apr 19 11:16:17 2018 InstallationDate: Installed on 2017-12-12 (127 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20171211) SourcePackage: gdm3 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/1765261/+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