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I'm running Ubuntu 18.04, it crashes about once a week. Sometimes while watching video sometime or just web-browsing. I check the system log and kernel log they don't have any strange output at the crash time, last output before crashing is something normal being outputed several times a day.

And I not able to use Ctrl+ALT+F3 to enter virtual terminal or REISUB reset , every time I had to restart my PC by powerbutton. How can I find where the problems are?

George Udosen
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Ives
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    Try looking in the /var/crash/ folder. – Terrance Aug 25 '18 at 01:44
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    journalctl -b -1 -e will show the last of the logs of the previous boot. Also, consider CPU overheating, power supply problems. They appear as instant OFF, and don't get logged. If multiple reboot logs (see man journalctl) show unrelated, random entries just before reboor, suspect hardware. – waltinator Aug 25 '18 at 03:52
  • @waltinator Thanks. I'll check when next crash happens(I hope not though), thermal and power are fine I'm sure. – Ives Aug 25 '18 at 09:29
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    You don't have to wait for the next crash. journalctl --list-boots will list boots (and their time/date), and you can adjust the -b # of journalctl -b -1 -e to select one. – waltinator Aug 25 '18 at 11:38
  • @waltinator Great, I found the last output logs and posted on another question. I don't know are they relevant to the crash or not. Would you take a look? https://askubuntu.com/questions/1068857/help-understand-last-output-logs-before-crashing – Ives Aug 25 '18 at 14:27

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