Recently I red an article about trimming of SSD on Linux systems. I decided to give it a shot, so I tweaked a setting in fstab file. Unfortunately, I wrote parameter "noatime" incorrectly as "noatima". Didn't notice it until next reboot. Now the box won't boot into GUI, but I have full access via CLI. But the problem is that root partition is mounted as read-only, so I can't change anything. Then I tried to boot from LiveCD, but no luck - partition still mounted as RO. I use Linux Mint 18, Cinnamon, 64-bit, the root partition is formatted with ext4.

How can I make root partition writable so I can save fstab file when I modify it?

p.s. - I am interested how to do it from Linux, don't suggest MiniXP with ext4 support or similar solutions, thank you.

As always, start by reading the manpage.

Good advice, thank you (didn't work in linux for a while, so I lost a few routines). Reading the man page did help, since I couldn't apply the command mount in form written here. But it worked only after I booted from a live CD, and then opened the fstab file with sudo privileges. When booting from local drive, the command exited with failure, because it used the local fstab file, which contained misspelled option, so I couldn't mount it.