Why is my file system mounted as read-only?
Try to search in dmesg | less
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If you would like remount it to read-write, use mount -o remount,rw /
I had a similar issue that is not solved with the solution above. Linux may mount a drive as 'read-only' because of Fastboot on Windows 10. A shutdown with the Fastboot feature keeps the Windows kernel and session running albeit it closes all applications and logs off users. By turning off Fastboot, windows will do a cold shutdown and linux will be able to mount the drive safely. You will loose the fast windows boot as a consequence.
To turn-off fast-boot on windows 10 do the following:
- Go to Control Panel.
- Click Power Options.
- Choose "what the power buttons do."
- Click "Change settings that are currently unavailable."
- Find and uncheck "Turn on fast startup."
- Save changes.
- Shutdown and boot linux.
References: https://itsfoss.com/solve-ntfs-mount-problem-ubuntu-windows-8-dual-boot/ https://www.howtogeek.com/243901/the-pros-and-cons-of-windows-10s-fast-startup-mode/