How can I see the log from the last shutdown of the computer ?
journalctl -b -1
is the log from the last boot
for the current boot.
May also be helpfull:
It’s funny how a very useful tool like Ksystemlog fails in something like this. If you want to see the last log there is no menu to choose log -1, -2, -3, etc. The only way to see older logs is increasing the number of lines it loads to 30,000. Too bad it doesn’t have such a basic function.
You can also filter by date. Here is a guide to journalctl