How to fix the “Read-Only File System” error on Ubuntu

If you're an Ubuntu user and you've ever encountered the "Read-Only File System" error, you know how frustrating it can be. This error message usually occurs when the file system is set to read-only mode, which means that you cannot make any changes to the files or directories on your system. This can be a serious problem, especially if you need to write or edit files frequently.

Source: FOSS Linux