Linux (installed on my PC) doesn't want to boot anymore. So I access my data on my hard disk by running Linux from a bootable Linux Live USB stick. But some files on my harddisk can only be read with local username. I tried to use the terminal: su - username, but it could not find this username.
So how (from my Live system) can I tell "su" to log in with the username which exists on the local harddisk? I need to do this because I forgot my email password which is locally stored by mozilla thunderbird's password manager.
