Adding New User Accounts
Only logins using SSH authentication are allowed; password-authenticated logins are not supported.
Create the user account. The Debian tool for doing this is useradd:
sudo useradd -G svnusers,webmaster -c "<full name>" -m <account-name>
Create the user's SSH authorization keys.
cd ~<account-name> mkdir .ssh chmod 700 .ssh/ jed .ssh/authorized_keys2 chmod 600 .ssh/authorized_keys2