Hi,
 

<Booting UML is straightforward. Simply run 'linux': it will try to mount the file `root_fs' in the current directory. You do not need to run it as root. If your root filesystem is not named `root_fs', then you need to put a `ubd0=root_fs_whatever' switch on the linux command line. >

 

I don't know the meaning of 'root_fs'.

Should I create a file name root_fs? If yes, where?

 

Thanks!

Best regards!