Vim cannot be modified and saved

Failure phenomena:

Use Vim to modify the file error, the system prompts the following:

E37:no write since last change (add! To override)

Cause of failure:

The file is a read-only file and cannot be modified.

Workaround:

Use the command: w! to force the disk, in Vim mode, type the following command:

: w!

After saving, use the VIM command to check whether to save, if not saved, edit and repeat the above operation.

If it cannot be saved, it may have the same name as other files, using forced exit combined with Save As
: wq!xxxxx

Vim cannot be modified and saved