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9

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?

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This looks like a login problem rather than boot problem… – Melebius Nov 10 '15 at 11:10
up vote 27 down vote

You can use two log files to view the boot problem.

/var/log/boot.log  ---  System boot log

/var/log/dmesg     ---  print or control the kernel ring buffer
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Hi I keep getting login incorrect or permission denied???? Thanks – Antony Dec 29 '11 at 15:09
    
can you proivde the log file. – Mughil Dec 29 '11 at 16:39
up vote 21 down vote

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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How can I save it to a file. – Lokesh Jan 3 '17 at 11:41
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To view boot messages...

dmesg

Or to page through the messages...

dmesg | less

And from the manual page:

The program helps users to print out their bootup messages. Instead of copying the messages by hand, the user need only: dmesg > boot.messages and mail the boot.messages file to whoever can debug their problem.

Is that what you are looking for?

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Thanks but from antony@antony I get Login incorrect. – Antony Dec 29 '11 at 14:20

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