Public bug reported: The System Program Problem Detected popup apparently causes system to hang. You can't switch to a terminal. You can't move a window. You can't interact within windows. Ctrl-alt-del took more than a minute to respond and then you have 30 seconds to answer cancel during which the system is also non-responsive.
This is not the only popup that causes this. The Program Not Responding Wait or Force Quit dialog has the same effect. It was disabled entirely. Ctrl-alt-del cancel method sometimes worked for that one. Appears to be related to grabbing mouse pointer. xwininfo said it could not grab mouse pointer (probably because apport already grabbed it). Actual dialog box was burried. Window had no title bar, it was hidden under top bar (top bar set to autohide). Showed "update-notifier" as program name. Was able to quit from the pulldown menu on top bar. After which, system became usable again. Data was almost lost in seamonkey composer because of the difficulty saving. I was using firefox at the time of the problem. Although firefox's memory utilization had been quite high, I had killed tabs and its memory usage was under 2GB. ps ... 1000 23538 23533 20 0 568668 149984 futex_ Sl pts/0 0:14 /usr/bin/python3 /usr/share/apport/apport-gtk update-notifier lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.4 LTS Release: 18.04 Codename: bionic dpkg -l python3 ii python3 3.6.7-1~18.0 amd64 interactive high-level object-ori dpkg -l | fgrep -i python3 | fgrep -i gtk ii python3-aptdaemon.gtk3widgets 1.1.1+bzr982-0ubuntu19.2 all Python 3 GTK+ 3 widgets to run an aptdaemon client ii python3-gtkspellcheck 4.0.5-1 all Python 3 spellchecking library for GTK+ based on Enchant dpkg -l |fgrep -i python | wc 818 9135 147661 ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: update-notifier 3.192.1.7 ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-generic 5.3.18 Uname: Linux 5.3.0-51-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.14 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Fri May 8 20:20:07 2020 InstallationDate: Installed on 2019-05-02 (372 days ago) InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: update-notifier UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: update-notifier (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug bionic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1877695 Title: Hangs system: System Program Problem Detected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-notifier/+bug/1877695/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs