Am using Mint 19, Tara, 64-bit, MATE. Had no problems with the OS and suddenly when trying to write some data in the terminal in taskwarrior, got an error message about not having permission. I closed all applications, logged out of Mint, got a message that something with virtualbox was not responding, I logged out anyway, and then I got the error message above:
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systemd-journald: failed to write entry, ignoring: read-only file system
Variations of this kept repeating. Am linking a screenshot:
I rebooted and everything seems to work fine. My root did only have 3.4 GB free, I deleted 9 GB from root. Also I began using timeshift yesterday (but not saving in /), not sure if it is related.
Is this error message something I need to be concerned about? How do I troubleshoot it?