@osomon One way to cause Thunderbird to freeze the system except mouse cursor and TTY can be accessed: Try opening a clean/fresh/purged then reinstalled installation of Thunderbird and set up email like yahoo or google, as the emails sync, click on the hamburger/three short parallel horizontal icon on the left, click Preferences, click Toolbar layout, then disable the title bar. After closing the Toolbar layout window, two orange (Ubuntu default theme) dots are still shown on the dock beside the icon. Clicking the icon causes the issue. Issue also occurs also on the snap package.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1870111 Title: Thunderbird freezes graphical session except mouse cursor on second launch or clicking the icon after email setup on the first launch Status in thunderbird package in Ubuntu: Incomplete Bug description: When Launching thunderbird (pinned on Favourites) from the dock/dash it shows 2 orange dots on default theme that is one for email setup and the other for the main window. After setting up an email and closing the email config window, the two dots are still shown on the dash/dock before the icon. Thunderbird causes the graphical session except for the mouse cursor to freeze until I switch to a TTY and reboot. Also when closing thunderbird, one dot is shown and when launching the application the graphical session except for mouse cursor freezes. ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: thunderbird 1:68.4.1+build1-0ubuntu0.19.10.1 ProcVersionSignature: Ubuntu 5.3.0-45.37-generic 5.3.18 Uname: Linux 5.3.0-45-generic x86_64 ApportVersion: 2.20.11-0ubuntu8.7 Architecture: amd64 BuildID: 20200110143530 CurrentDesktop: ubuntu:GNOME Date: Wed Apr 1 13:26:59 2020 DefaultProfileExtensions: extensions.sqlite corrupt or missing DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) DefaultProfileLocales: extensions.sqlite corrupt or missing DefaultProfilePrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/thunderbird/omni.ja:greprefs.js:1141 DefaultProfileThemes: extensions.sqlite corrupt or missing InstallationDate: Installed on 2020-03-31 (1 days ago) InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017) Profiles: Profile1 (Default) - LastVersion=None/None (Out of date) Profile0 - LastVersion=68.4.1/20200110143530 SourcePackage: thunderbird UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1870111/+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