Howto redefine the hostname on Debian/Ubuntu

Just a small procedure as a self-reminder (I seem to have to use it just seldom enough to forget it each time – thanks Marvil):

• define the new hostname on the 127.0.0.1 localhost line (after localhost) in /etc/hosts
• set the new name in /etc/hostname
• issue a “hostname -F /etc/hostname
• done

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