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I want to change the hostname of a Ubuntu 18.04 server.

I did:

hostnamectl --set-hostname newname --static
changed /etc/hostname file to newname
cahnged /etc/hosts file to newname
rm -f /etc/machine-id
dbus-uuidgen --ensure=/etc/machine-id
dbus-uuidgen --ensure
dpkg-reconfigure openssh-server

Finally I did a reboot. But after reboot there is still the old hostname. The file /etc/hostname has been changed to the old hostname.

How to permanently change the hostname?

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  • hi. did you try "hostname newname" as root?
    – jpbrain
    Sep 15 at 1:36
  • yes, of course all commands as root Sep 15 at 1:47
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Additionally I had to change the file /etc/cloud/cloud.cfg

There is a setting preserve_hostname: false

I had to change that from false to true. After rebbot hostname had changed.

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