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I understand if I boot from a live cd I can see all the system logs under System > Administration > File Log Viewer

I have a major error with a disk not mounting and I want to trace i tback to the last time it did work and what may have corrupted the ext4 filesystem on it.

So within the File Log Viewer Where do I start examining?

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  • Are you only looking at the logs that were generated by the LiveCD starting up? Or are you looking at the logs on the host filesystem?
    – idbrii
    May 5, 2011 at 20:40
  • ah you can also just search all the logs from commandline: cd /var/log/ and do a grep -R mount * (assuming you want to see all lines that contain mount).
    – Rinzwind
    May 5, 2011 at 20:46

2 Answers 2

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I'd guess /var/log/dmesg

You can find all logs that mention mounting or ext4 like this:

grep -e mount -e ext4 -lR /var/log 2> /dev/null

dmesg seemed to be the most relevant to me. And there are archived versions (dmesg.*).

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9

You can find aditional information in syslog

grep 'Mounted' /var/log/syslog*

or find mounted and unmounted logs

grep 'Mounted\|Unmounted' /var/log/syslog*
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  • I know this has been downvoted because it does not allow to see when a disk has last been successfully mounted (as was asked), but you can still find some interesting debugging info there as why a disk was not mounted or why it was automatically unmounted.
    – Sindarus
    Jul 4, 2019 at 18:08
  • I am a beginner and somehow this command was easier to use.
    – linuxUser123
    Jun 23, 2020 at 14:40
  • I voted for this response because I didn't find /var/log/dmesg in Ubuntu Studio 18.04. I did find a mount error code in /var/log/syslog; unfortunately, it didn't reveal anything I didn't already know.
    – R B
    Jul 4, 2020 at 15:18

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