I might be experiencing same/similar bug on a fresh install of 20.04. I don't have a Yubikey. Or at least I don't think I do :).
In my case the bug is triggered when I try to open a folder needing root permissions. Sometimes I get an auth dialog and it let's me browse the folder. More often I just get a spinning wheel and nothing happens... or so I think, until I lock my computer. Upon unlocking it, I get a stuck auth window, which is not entirely unlike the one OP is getting (see screen shot attached). There is no way to get rid of the window, other than reload gnome-shell. (Thanks polalbert!) -- 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/1824874 Title: undismissable, unclickable authentication dialog left on screen (top- left corner) after policykit authentication [pushModal: invocation of begin_modal failed] Status in gnome-shell package in Ubuntu: Confirmed Bug description: In disco, when policykit prompted me for a password in order for update-manager to dispatch instructions to aptdaemon to perform package updates, the password dialog remained on the screen after I clicked 'authenticate'. The window is not clickable, it appears not to even be a window - mouse presses are received by the window underneath. The exception is that the 'cancel' button is active and receives mouse events - but clicking it does nothing. This may be a gnome-shell issue rather than policykit. ProblemType: Bug DistroRelease: Ubuntu 19.04 Package: policykit-1 0.105-25 ProcVersionSignature: Ubuntu 5.0.0-8.9-generic 5.0.1 Uname: Linux 5.0.0-8-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.10-0ubuntu27 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Mon Apr 15 13:14:33 2019 InstallationDate: Installed on 2010-09-24 (3125 days ago) InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1) SourcePackage: policykit-1 UpgradeStatus: Upgraded to disco on 2019-04-11 (3 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1824874/+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
