why does ubuntu 24.04lts crash to my login screen?

Question

I'll be browsing with FireFox and suddenly the machine locks-up (conky freezes, mouse freezes, keyboard non-responsive, etc.) , but the hard drive light is blinking away furiously, then it crashes to a blank screen and after a few minutes goes to my login screen, losing all my work... why?

Here's the last boot.log from this morning when it did it:

    ------------ Fri Jun 21 05:41:37 CDT 2024 ------------
/dev/sda5: clean, 428623/6406144 files, 9277289/25600000 blocks
[[0;32m  OK  [0m] Finished [0;1;39mplymouth-read-write.service[0m - Tell Plymouth To Write Out Runtime Data.

[[0;32m  OK  [0m] Started [0;1;39mplymouth-start.service[0m - Show Plymouth Boot Screen.

[[0;32m  OK  [0m] Started [0;1;39msystemd-ask-password-plymouth.path[0m - Forward Password Requests to Plymouth Directory Watch.

[[0;32m  OK  [0m] Reached target [0;1;39mcryptsetup.target[0m - Local Encrypted Volumes.

[[0;32m  OK  [0m] Finished [0;1;39msystemd-journal-flush.service[0m - Flush Journal to Persistent Storage.

         Starting [0;1;39msystemd-tmpfiles-setup.service[0m - Create Volatile Files and Directories...

[[0;32m  OK  [0m] Finished [0;1;39msystemd-tmpfiles-setup.service[0m - Create Volatile Files and Directories.

         Starting [0;1;39msystemd-oomd.service[0m - ***Userspace Out-Of-Memory (OOM) Killer***...

         Starting [0;1;39msystemd-resolved.service[0m - Network Name Resolution...

         Starting [0;1;39msystemd-timesyncd.service[0m - Network Time Synchronization...

         Starting [0;1;39msystemd-update-utmp.service[0m - Record System Boot/Shutdown in UTMP...

[[0;32m  OK  [0m] Finished [0;1;39msystemd-update-utmp.service[0m - Record System Boot/Shutdown in UTMP.

[[0;32m  OK  [0m] Started [0;1;39msystemd-timesyncd.service[0m - Network Time Synchronization.

[[0;32m  OK  [0m] Reached target [0;1;39mtime-set.target[0m - System Time Set.

[[0;32m  OK  [0m] Started [0;1;39msystemd-oomd.service[0m - *Userspace Out-Of-Memory (OOM) Killer*.

[[0;32m  OK  [0m] Started [0;1;39msystemd-resolved.service[0m - Network Name Resolution.

[[0;32m  OK  [0m] Reached target [0;1;39mnss-lookup.target[0m - Host and Network Name Lookups.

[[0;1;31mFAILED[0m] Failed to start [0;1;39mapparmor.service[0m - Load AppArmor profiles.

See 'systemctl status apparmor.service' for details.

         Starting [0;1;39mnetworking.service[0m - Raise network interfaces...

         Starting [0;1;39msnapd.apparmor.service[0m - Load AppArmor profiles managed internally by snapd...

[[0;32m  OK  [0m] Finished [0;1;39mnetworking.service[0m - Raise network interfaces.

[[0;32m  OK  [0m] Finished [0;1;39msnapd.apparmor.service[0m - Load AppArmor profiles managed internally by snapd.

[[0;32m  OK  [0m] Reached target [0;1;39msysinit.target[0m - System Initialization.

[[0;32m  OK  [0m] Started [0;1;39mapport-autoreport.path[0m - Process error reports when automatic reporting is enabled (file watch).

[[0;32m  OK  [0m] Started [0;1;39mcups.path[0m - CUPS Scheduler.

[[0;32m  OK  [0m] Started [0;1;39mwhoopsie.path[0m - Start whoopsie on modification of the /var/crash directory.

[[0;32m  OK  [0m] Started [0;1;39manacron.timer[0m - Trigger anacron every hour.

[[0;32m  OK  [0m] Started [0;1;39mapport-autoreport.timer[0m - Process error reports when automatic reporting is enabled (timer based).

[[0;32m  OK  [0m] Started [0;1;39mapt-daily.timer[0m - Daily apt download activities.

[[0;32m  OK  [0m] Started [0;1;39mapt-daily-upgrade.timer[0m - Daily apt upgrade and clean activities.

[[0;32m  OK  [0m] Started [0;1;39mdpkg-db-backup.timer[0m - Daily dpkg database backup timer.

[[0;32m  OK  [0m] Started [0;1;39me2scrub_all.timer[0m - Periodic ext4 Online Metadata Check for All Filesystems.

[[0;32m  OK  [0m] Started [0;1;39mfstrim.timer[0m - Discard unused filesystem blocks once a week.

[[0;32m  OK  [0m] Started [0;1;39mfwupd-refresh.timer[0m - Refresh fwupd metadata regularly.

[[0;32m  OK  [0m] Started [0;1;39mlogrotate.timer[0m - Daily rotation of log files.

[[0;32m  OK  [0m] Started [0;1;39mman-db.timer[0m - Daily man-db regeneration.

[[0;32m  OK  [0m] Started [0;1;39mmotd-news.timer[0m - Message of the Day.

[[0;32m  OK  [0m] Started [0;1;39msystemd-tmpfiles-clean.timer[0m - Daily Cleanup of Temporary Directories.

[[0;32m  OK  [0m] Reached target [0;1;39mpaths.target[0m - Path Units.

[[0;32m  OK  [0m] Listening on [0;1;39mavahi-daemon.socket[0m - Avahi mDNS/DNS-SD Stack Activation Socket.

[[0;32m  OK  [0m] Listening on [0;1;39mcups.socket[0m - CUPS Scheduler.

[[0;32m  OK  [0m] Listening on [0;1;39mdbus.socket[0m - D-Bus System Message Bus Socket.

         Starting [0;1;39msnapd.socket[0m - Socket activation for snappy daemon...

[[0;32m  OK  [0m] Listening on [0;1;39muuidd.socket[0m - UUID daemon activation socket.

[[0;32m  OK  [0m] Listening on [0;1;39msnapd.socket[0m - Socket activation for snappy daemon.

[[0;32m  OK  [0m] Reached target [0;1;39msockets.target[0m - Socket Units.

[[0;32m  OK  [0m] Reached target [0;1;39mbasic.target[0m - Basic System.

[[0;32m  OK  [0m] Started [0;1;39manacron.service[0m - Run anacron jobs.

         Starting [0;1;39mapport.service[0m - automatic crash report generation...

         Starting [0;1;39mavahi-daemon.service[0m - Avahi mDNS/DNS-SD Stack...

         Starting [0;1;39mdbus.service[0m - D-Bus System Message Bus...

[[0;32m  OK  [0m] Started [0;1;39mdmesg.service[0m - Save initial kernel messages after boot.

         Starting [0;1;39mdundee.service[0m - DUN service...

         Starting [0;1;39me2scrub_reap.service[0m - Remove Stale Online ext4 Metadata Check Snapshots...

[[0;32m  OK  [0m] Reached target [0;1;39mgetty.target[0m - Login Prompts.

         Starting [0;1;39mgnome-remote-desktop.service[0m - GNOME Remote Desktop...

         Starting [0;1;39mgpu-manager.service[0m - Detect the available GPUs and deal with any system changes...

         Starting [0;1;39mgrub-common.service[0m - Record successful boot for GRUB...

[[0;32m  OK  [0m] Started [0;1;39mirqbalance.service[0m - irqbalance daemon.

         Starting [0;1;39mlm-sensors.service[0m - Initialize hardware monitoring sensors...

         Starting [0;1;39mmono-xsp4.service[0m - LSB: Mono XSP4...

         Starting [0;1;39mofono.service[0m - Telephony service...

         Starting [0;1;39mpolkit.service[0m - Authorization Manager...

         Starting [0;1;39mpower-profiles-daemon.service[0m - Power Profiles daemon...

         Starting [0;1;39mpulseaudio-enable-autospawn.service[0m - LSB: Enable pulseaudio autospawn...

         Starting [0;1;39mrsyslog.service[0m - System Logging Service...

[[0;32m  OK  [0m] Reached target [0;1;39mgetty-pre.target[0m - Preparation for Logins.

         Starting [0;1;39msnapd.seeded.service[0m - Wait until snapd is fully seeded...

         Starting [0;1;39msnapd.service[0m - Snap Daemon...

[[0;32m  OK  [0m] Reached target [0;1;39mnss-user-lookup.target[0m - User and Group Name Lookups.

[[0;1;38;5;185mDEPEND[0m] **Dependency failed** for [0;1;39msssd-nss.socket[0m - SSSD NSS Service responder socket.

[[0;1;38;5;185mDEPEND[0m] **Dependency failed** for [0;1;39msssd-autofs.socket[0m - SSSD AutoFS Service responder socket.

[[0;1;38;5;185mDEPEND[0m] **Dependency failed** for [0;1;39msssd-pac.socket[0m - SSSD PAC Service responder socket.

[[0;1;38;5;185mDEPEND[0m] **Dependency failed** for [0;1;39msssd-pam-priv.socket[0m - SSSD PAM Service responder private socket.

[[0;1;38;5;185mDEPEND[0m] **Dependency failed** for [0;1;39msssd-pam.socket[0m - SSSD PAM Service responder socket.

[[0;1;38;5;185mDEPEND[0m] **Dependency faile**d for [0;1;39msssd-ssh.socket[0m - SSSD SSH Service responder socket.

[[0;1;38;5;185mDEPEND[0m] **Dependency failed** for [0;1;39msssd-sudo.socket[0m - SSSD Sudo Service responder socket.

         Starting [0;1;39msystemd-logind.service[0m - User Login Management...

         Starting [0;1;39maccounts-daemon.service[0m - Accounts Service...

[[0;32m  OK  [0m] Started [0;1;39mcron.service[0m - Regular background program processing daemon.

         Starting [0;1;39mswitcheroo-control.service[0m - Switcheroo Control Proxy service...

         Starting [0;1;39mthermald.service[0m - Thermal Daemon Service...

         Starting [0;1;39mudisks2.service[0m - Disk Manager...

[[0;32m  OK  [0m] Finished [0;1;39mlm-sensors.service[0m - Initialize hardware monitoring sensors.

[[0;32m  OK  [0m] Finished [0;1;39mgpu-manager.service[0m - Detect the available GPUs and deal with any system changes.

[[0;32m  OK  [0m] Started [0;1;39msystemd-logind.service[0m - User Login Management.

[[0;32m  OK  [0m] Started [0;1;39mpulseaudio-enable-autospawn.service[0m - LSB: Enable pulseaudio autospawn.

[[0;32m  OK  [0m] Finished [0;1;39me2scrub_reap.service[0m - Remove Stale Online ext4 Metadata Check Snapshots.

[[0;32m  OK  [0m] Finished [0;1;39mgrub-common.service[0m - Record successful boot for GRUB.

         Starting [0;1;39mgrub-initrd-fallback.service[0m - **GRUB failed boot detection**...

[[0;32m  OK  [0m] Finished [0;1;39mgrub-initrd-fallback.service[0m - **GRUB failed boot detection**.

[[0;32m  OK  [0m] Started [0;1;39mmono-xsp4.service[0m - LSB: Mono XSP4.

[[0;32m  OK  [0m] Started [0;1;39mthermald.service[0m - Thermal Daemon Service.

[[0;32m  OK  [0m] Started [0;1;39mrsyslog.service[0m - System Logging Service.

[[0;32m  OK  [0m] Started [0;1;39mdbus.service[0m - D-Bus System Message Bus.

         Starting [0;1;39mNetworkManager.service[0m - Network Manager...

         Starting [0;1;39mconnman.service[0m - Connection service...

         Starting [0;1;39mwpa_supplicant.service[0m - WPA supplicant...

[[0;32m  OK  [0m] Started [0;1;39mavahi-daemon.service[0m - Avahi mDNS/DNS-SD Stack.

[[0;32m  OK  [0m] Started [0;1;39mdundee.service[0m - DUN service.

[[0;32m  OK  [0m] Started [0;1;39mswitcheroo-control.service[0m - Switcheroo Control Proxy service.

[[0;32m  OK  [0m] Started [0;1;39mofono.service[0m - Telephony service.

         Starting [0;1;39malsa-restore.service[0m - Save/Restore Sound Card State...

[[0;32m  OK  [0m] Finished [0;1;39malsa-restore.service[0m - Save/Restore Sound Card State.

[[0;32m  OK  [0m] Reached target [0;1;39msound.target[0m - Sound Card.

[[0;32m  OK  [0m] Started [0;1;39mpolkit.service[0m - Authorization Manager.

         Starting [0;1;39mModemManager.service[0m - Modem Manager...

[[0;32m  OK  [0m] Started [0;1;39mgnome-remote-desktop.service[0m - GNOME Remote Desktop.

[[0;32m  OK  [0m] Started [0;1;39mpower-profiles-daemon.service[0m - Power Profiles daemon.

[[0;32m  OK  [0m] Started [0;1;39maccounts-daemon.service[0m - Accounts Service.

[[0;32m  OK  [0m] Started [0;1;39mwpa_supplicant.service[0m - WPA supplicant.

[[0;32m  OK  [0m] Started [0;1;39mconnman.service[0m - Connection service.

         Starting [0;1;39mconnman-wait-online.service[0m - Wait for network to be configured by ConnMan...

         Starting [0;1;39msystemd-hostnamed.service[0m - Hostname Service...

[[0;32m  OK  [0m] Started [0;1;39msystemd-hostnamed.service[0m - Hostname Service.

[[0;32m  OK  [0m] Started [0;1;39mudisks2.service[0m - Disk Manager.

         Starting [0;1;39mNetworkManager-dispatcher.service[0m - Network Manager Script Dispatcher Service...

[[0;32m  OK  [0m] Started [0;1;39mNetworkManager-dispatcher.service[0m - Network Manager Script Dispatcher Service.

[[0;32m  OK  [0m] Started [0;1;39mModemManager.service[0m - Modem Manager.

[[0;32m  OK  [0m] Finished [0;1;39mconnman-wait-online.service[0m - Wait for network to be configured by ConnMan.

         Starting [0;1;39mapport-autoreport.service[0m - **Process error reports when automatic reporting is enabled**...

[[0;32m  OK  [0m] Finished [0;1;39mapport.service[0m - **automatic crash report generation**.

[[0;32m  OK  [0m] Finished [0;1;39mapport-autoreport.service[0m - **Process error reports when automatic reporting is enabled**.

[[0;32m  OK  [0m] Started [0;1;39msnapd.service[0m - Snap Daemon.

         Starting [0;1;39msystemd-timedated.service[0m - Time & Date Service...

[[0;32m  OK  [0m] Started [0;1;39msystemd-timedated.service[0m - Time & Date Service.

[[0;32m  OK  [0m] Finished [0;1;39msnapd.seeded.service[0m - Wait until snapd is fully seeded.

[[0;32m  OK  [0m] Started [0;1;39mNetworkManager.service[0m - Network Manager.

[[0;32m  OK  [0m] Reached target [0;1;39mnetwork.target[0m - Network.

         Starting [0;1;39mNetworkManager-wait-online.service[0m - Network Manager Wait Online...

         Starting [0;1;39mcups.service[0m - CUPS Scheduler...

[[0;32m  OK  [0m] Started [0;1;39msnap.network-manager.networkmanager.service[0m - **Service for snap application network-manager.networkmanager**.

         Starting [0;1;39msystemd-user-sessions.service[0m - Permit User Sessions...

[[0;32m  OK  [0m] Started [0;1;39munattended-upgrades.service[0m - **Unattended Upgrades Shutdown.**

[[0;32m  OK  [0m] Finished [0;1;39msystemd-user-sessions.service[0m - Permit User Sessions.

         Starting [0;1;39mgdm.service[0m - GNOME Display Manager...

         Starting [0;1;39mplymouth-quit-wait.service[0m - **Hold until boot process finishes up**...

[[0;32m  OK  [0m] Started [0;1;39mgdm.service[0m - GNOME Display Manager.

(emphasis mine) Don't know if this helps...

Among other possible reasons, insufficient RAM. Your Ubuntu system has tools to monitor RAM usage. — user535733, Commented Jun 21 at 18:43
If you have such issues, take a look at the journal for the previous boot, save it and post. Asking in a low-effort way like this will not yield solutions or people willing to look into it. — Balázs Börcsök, Commented Jun 21 at 19:39
posted boot.log ~ noticed that just before it crashed/logout today, I paused the streaming video but noticed the processor use was very high for no apparent reason, for nothing streaming - ram is only about 2/3 used so not ram/swap file issue. Changed update for security from 'download and install immediately' to just display immediately - may be what's overloading the machine and dumping me out? — The MAJOR, Commented Jun 23 at 13:24

The MAJOR · Accepted Answer · 2024-06-27 01:33:38Z

Changed update for security from 'download and install immediately' to just 'display immediately' - afterwards suddenly, a security update popped-up - it was trying to download 196Mb, install, and then need to reboot to finish ~ something like that is what's overloading the machine and dumping me out in a panic attack.

My 2Gb Ram was not affected (still had plenty and swapfile very small), but the 2 gig dual core processor was just getting jammed - I could see Conky display activity where processor was maxed yet no streaming or anything heavy on firefox was going on.

Well, the main thing is the dumping me to login has stopped - still don't understand the mechanics of it freezing up and instead of just staying locked-up it logs out! Better than going to reboot I guess...

Now I get a notice to update while browsing or streaming which I can minimize the notice and let it get taken care of next boot up :-D

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