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This has happened randomly on a couple of restarts I've been googling to figure out where the log file is that would show what is causing this to happen as it doesn't happen every time.

EDIT:

log file contents https://i.stack.imgur.com/tdLtz.jpg

wasn't sure how I was going to copy paste they are in order of bootlog, syslog error, failed

kernel and syslog critical returned nothing

EDIT2:

Added dmesg not sure if the two I/O lines are errors or if it only out put errors sorry :/

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  • No weird things in those logs. Nothing that would cause a read only system, Care to do the fsck -N sda?
    – Rinzwind
    Jan 25, 2017 at 16:57
  • fsck -N sda outputs [/sbin/fsck.ext4 (1) -- /l fsck.ext4 sda /dev/mapper/CAC_VG-CAC_LV [/sbin/fsck.ext4 (1) -- /boot] fsck.ext4 sda /dev/sda1
    – Austin
    Jan 25, 2017 at 17:04

1 Answer 1

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All log files are in /var/log/.

Important log files that might contain what you are looking for:

  • boot.log
  • kernel.log
  • syslog

Use commandline or log viewer from the GUI to search for words like "error", "critical", "failed". Edit your question and copy/paste results of these in it or use google to search these notice.

The command dmesg also will show you info on your system.

"I/O error" is another to search for. A failing hard disk will end up with I/O errors and that would cause the filesystem to randomly mount read only.

fsck -N {device} does a filesystem check without actually changing something (aka. a dry run)

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