Ubuntu – How to see log to find a boot problem

bootlog

I want to find the cause of a boot problem I have tried
ls -ltr /var/log from antony@antony which gives me login incorrect
can someone tell me what command to use to see what has upset the boot thanks

NB when trying some commands from antony@antony then password I get login incorrect.
Is that right?

Best Answer

For systemd based versions of Ubuntu (15.04 onwards) you'll need to use the journalctl command to view the current boot log messages (as mentioned in this answer, and here for more info on how to enable them for previous boots):

journalctl -b

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If you have apache2 running on the system, check /var/log/apache2/access.log ? I usually get ping records from that log and it was beneficial for me.

People would would "generally" able to access your host would be port :80 :443 :21 :20 :22, I believe. So, check your http engine log (like apache2); ftp access log; and syslog/ssh. Maybe that direction would give you more insight in find out about unauthorized attempts.

Ubuntu – Where is log file from rc.local

Unless a command has output or logging already configured, rc.local commands will not log anywhere.

If you want to see logs for specific commands, try redirecting the stdout and stderr for rc.local to somewhere you can check. Try adding this to the top of your /etc/rc.local file:

exec 1>/tmp/rc.local.log 2>&1  # send stdout and stderr from rc.local to a log file
set -x                         # tell sh to display commands before execution

Though this will require to rerun the rc.local file.

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