Set hostname on ubuntu

I am installing PLESK and get the error:
Unable to determine the host or domain name of your computer.

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A tutorial said to run the following commands for diagnostics.

root@lamp /tmp# uname -n
root@lamp /tmp# hostname -a

root@lamp /tmp# hostname -s
root@lamp /tmp# hostname -d
root@lamp /tmp# hostname -f
root@lamp /tmp# hostname

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What's the next step.
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hostname your_host_name

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