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This question already has an answer here:

Can someone tell me how to change the computer name on a pc, I've tried to edit the /etc/hostname file but it won't allow me access to save the amended file, thought the user the system created was the administrator obviously not.

Thanks

marked as duplicate by Eric Carvalho, bcbc, Alvar, Radu Rădeanu, Mitch Jun 22 '13 at 13:54

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  • Run in a Terminal: sudo nano /etc/hostname when asked enter your password, then edit the displayed text. – koni_raid May 9 '13 at 12:25
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Changing the hostname or computer name in ubuntu

Edit /etc/hostname and change to the new value, for example name we are using hostname Ubuntu

sudo nano /etc/hostname
Ubuntu    

Edit /etc/hosts and change the old 127.0.1.1 line to your new hostname

127.0.0.1   localhost
127.0.1.1   ubuntu.local    ubuntu   # change to your new hostname/fqdn

Note : Edit /etc/hosts and change the old 127.0.1.1 line to your new hostname (if you dont do this, you wont be able to use sudo anymore. If you hav e already done it, press ESC on the grub menu, choose recovery, and edit your host file to the correct settings)

Now after a reboot, your hostname will be the new one you chose

If you want to apply the change without a reboot,

sudo service hostname restart

OR

 sudo /etc/init.d/hostname restart

Note : Above command to make the change active. The hostname saved in this file (/etc/hostname) will be preserved on system reboot (and will be set using the same script we used hostname).

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You need to change 2 files and can use the following commands for that...

pkexec nano /etc/hostname
pkexec nano /etc/hosts

Only change the name; nothing else.

  • says cannot open display? – Belstead54 May 9 '13 at 12:32
  • Are you using ssh to connect to the system? That message means that there is no X server active(?) – Rinzwind May 9 '13 at 12:35

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