Change computer name on Ubuntu

1.Edit /etc/hostname, make the name change, save the file.

2.You should also make the same changes in /etc/hosts file

3. Run sudo /etc/init.d/hostname restart or sudo service hostname restart

http://askubuntu.com/a/16443

SSH root login permit

sudo -i

sudo passwd root

1. Edit the sshd_config file by sudo vi /etc/ssh/sshd_config

2. Find the line PermitRootLogin no and change it to PermitRootLogin yes.

3. Restart the ssh service by sudo /etc/init.d/ssh restart or sudo service ssh restart

http://askubuntu.com/questions/372380/remote-ssh-root-login-with-ubuntu-12-04