How to change files under linux maintenance mode

When system boots into maintenance, it mounts / as read only mode. When you want to fix it, it doesn't allow writing. Here is a way to fix without envolving recue CD booting.

mount -o remount,rw /

Now, you have write permission to / file system.

For other types of booting problems, for example, driver issue, rpm issue, which cause system can't boot, take a look this article

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