The root account is not enabled on the Linutop OS. All
administrative tasks need to be executed using sudo:
$ sudo ls /root $ sudo service ssh restart
If a password is requested, you must use the one of your current user.
gksudo can be used instead of sudo to graphically ask for the user password.
On Linutop OS for PC, the linutop user default password is blank.
On Linutop OS XS (Raspberry Pi) the pi user default password is raspberry.
To enable the root account, set its password:
$ sudo passwd