Need to modify linux filesystem when mounted in read-only?

In cases where you’re at the Repair Filesystem prompt and need to modify one or more files to fix what is broken then you can mount the root in read-write mode to avoid needing the rescue disk. Otherwise the disk is mounted in read-only mode and you’re unable to modify any files.

The following command will mount the root in read-write mode:

mount -w -o remount /

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