Renaming home folder

[ElektromAn]

adam@Debian-Desktop:~$ tail /etc/passwd /etc/shadow /etc/group

Please not the $ sign
you are (mostly and not fouling yourself) a ordinary user here.

tail and other things with /etc/shadow will not work here.

Without looking in the wiki, I think sudo is missing here with the usermod command

If you messed up the thing and can't login via login greeter use the magic keys
CTRL-F1
and login as root or better as ordinary.
Note if your $home does not exist, you can't login, so you must use root