What to do with old users in /etc/shadow after foramtting the home partition? : My `/home` partition was corrupted, so i had to backup the drive and format it. My all other partitions (including `/root`) do still work. I am willing to setup new users now, but old users like `www-dev`, `avahi`, plus my personal old-user home folder still all exist in `/etc/shadow`. How can I delete them? Can i still use my `/root` partition?

I am still able to boot into my Linux OS and login with user root.