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I noticed that I got some error when my Debian Wheezy was starting today, but then I couldn't find anywhere to look into it in more detail. There was nothing interesting in dmesg or syslog. Where can I find these messages?

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up vote 5 down vote accepted

Install the bootlogd package, the output will then be logged in /var/log/boot. You can format the output correctly with (in bash):

sed $'s/\^\[/\E/g;s/\[1G\[/\[27G\[/' /var/log/boot

See also - http://stackoverflow.com/questions/10757823/display-file-with-escaped-color-codes-boot-messages-from-bootlog-daemon/19011140

Also related - How to read the messages during power off

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