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I tried to change the FQDN in Ubuntu using sudo -i gedit /etc/hosts and change as shown below:

127.0.0.1   localhost
127.0.1.1   ubuntu.example.com
192.168.217.129 ubuntu.example.com

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

after that I tried:

hostname -f

which shows: 

hostname: Name or service not known

How can I change the FQDN?

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4
  • Try the most popular answer here: askubuntu.com/questions/158957/…
    – Kinnectus
    Dec 18, 2015 at 7:01
  • The below link will help you. askubuntu.com/questions/158957/…
    – Hussain7
    Dec 18, 2015 at 7:01
  • Well what'ya know!
    – Kinnectus
    Dec 18, 2015 at 7:02
  • rather than using sudo with gedit, might I suggest nano? It's quite easy. Occasionaly, vi is the only real option -- but I think that's realistically only for visudo. I wouldn't mix gedit and sudo, myself.
    – Thufir
    Jan 4, 2017 at 12:18

1 Answer 1

Reset to default
4

Edit /etc/hostname and put ubuntu 

echo "ubuntu" > /etc/hostname

Put hostname entry as well in following format in /etc/hosts

IP  fqdn   hostname

Your /etc/hosts should look like

  127.0.0.1   localhost
  127.0.1.1   ubuntu.example.com  ubuntu
  192.168.217.129 ubuntu.example.com  ubuntu 
# The following lines are desirable for IPv6 capable hosts
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