Find out what caused my Ubuntu rebooting?

Question

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.

@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. — Tim, Jul 5 '15 at 18:50

Jodka Lemon · Accepted Answer · 2015-07-05 18:56:41Z

1

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.

answered Jul 5 '15 at 18:56

Jodka Lemon

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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? – Tim 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. – Tim Jul 5 '15 at 19:52

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