My Ubuntu 14.04 on Thinkpad T400 just rebooted automatically.

Before that,

  • my screen just became unresponsive.

  • My memory and swap were mostly used, mainly by webpages opened in Chrome and some pdf software.

  • The cpu and hard drive didn't feel hot. At least shortly before the screen became unresponsive, their temperatures were normal (60 celcius and 40 celcius respectively).

How can I find out what caused its reboot?

Output of less /var/log/syslog is here.

  • Thanks. journalctl: command not found – StackExchange for All Jul 5 '15 at 18:02
  • Is systemd installed? – Jodka Lemon Jul 5 '15 at 18:48
  • @Jodka: dpkg -l | grep -i systemd returns systemd-services and systemd-shim and some libraries. ps aux | grep -i systemd returns /lib/systemd/systemd-udevd --daemon and /lib/systemd/systemd-logind. – StackExchange for All Jul 5 '15 at 18:50
  • You are right. Systemd is not part of 14.04. – Jodka Lemon Jul 5 '15 at 18:54
  • @Jodka: How do you know it is not part of 14.04? – StackExchange for All Jul 5 '15 at 18:54

See less /var/log/syslog, less /var/log/dmesg and the older versions of these files. gziped backups of these files can be read with zless.

  • thanks. see my update with the output of the first command. What do you think is the cause of the reboot a little more than one hour ago? – StackExchange for All Jul 5 '15 at 19:02
  • You wifi card, but I am not sure. What is the output of lspci? – Jodka Lemon Jul 5 '15 at 19:44
  • lspci output is here. My wifi card always has some problem, but the reboot is very rare. – StackExchange for All Jul 5 '15 at 19:52

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