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1 day 3-4 restarts system carshed
Hello, can someone help me, ubuntu has been running for 3 years, but it's been struggling for 1 week since it updated itself.
1 day 3-4 restarts system carshed.
But I have done all the checks, there is no memory error, there is no overheating.
Could someone help me find out what is the cause of this bunch of reboots, that's all the log showed.
root@ryzen:/home/ryzen# last -x | head | tac
reboot system boot 5.4.0-200-generi Tue Nov 12 13:53 - 19:14 (05:21)
ryzen pts/0 xxx.xxx.xxx.xxx Tue Nov 12 18:28 - crash (00:08)
reboot system boot 5.4.0-200-generi Tue Nov 12 18:36 - 19:14 (00:37)
ryzen pts/0 xxx.xxx.xxx.xxx Tue Nov 12 18:37 - 19:14 (00:37)
ryzen pts/1 xxx.xxx.xxx.xxx Tue Nov 12 19:08 - 19:14 (00:05)
shutdown system down 5.4.0-200-generi Tue Nov 12 19:14 - 19:14 (00:00)
reboot system boot 5.4.0-200-generi Tue Nov 12 19:14 still running
ryzen pts/0 xxx.xxx.xxx.xxx Tue Nov 12 19:15 - crash (06:13)
reboot system boot 5.4.0-200-generi Wed Nov 13 01:29 still running
ryzen pts/0 xxx.xxx.xxx.xxx Wed Nov 13 04:26 still logged in
root@ryzen:/home/ryzen#

Comments
Are you certain the software updates are what triggered it? Can you revert back to test, or change kernels (or update to 6.X since you're on 5.X) and test? What's your motherboard and drive configuration?
I would use journalctl to check the logs.
root@ryzen
Packages: 1738 (dpkg), 5 (snap)
Shell: bash 5.0.17
CPU: AMD Ryzen 3 2200G (4) @ 3.600GH
GPU: AMD ATI Radeon Vega Series / Ra
Memory: 2371MiB / 13795MiB
setup a rsyslog and send that server logs somewhere else, keep an eye on that. your information is nowhere near enough to troubleshoot anything
Check firmware, could be related if you're not slipping into some odd S-state.
Otherwise what @ScreenReader said, said up a rsyslog.
I also suspect the reason for an update was because you encountered issues, perhaps not so severe, did an update and now things are getting worse. Depending on state where the machine is at, could be RAM or PSU. Tarot cards also work when no one is giving up full info.