i created the account with the command 'useradd -d /home/hacksign'
but i cannot startx
error is
cannot open /dev/tty0 (Permission Denied)
ls -l /dev/tty0 is
lwrxwrxwrx root root ...
and i tried add the user hacksign to the groups below
sys bin root adm users

but the error remains
what should i do ?