Public bug reported:
probably a "paper cut" issue here. On 16.04.
Changed the hostname of a system recently by opening the system settings
tool, into details, and typing a new device name.
Noticed afterwards that running sudo commands in the terminal resulted
in an 'unable to resolve hostname' message, although the commands ran
successfully.
Checked and it looked like changing the name updates /etc/hostname as
expected, but it didn't update /etc/hosts for me - it still had:
127.0.0.1 localhost
127.0.1.1 (old hostname)
Replacing the old hostname with the new one removed the message from the
terminal when running sudo commands.
** Affects: unity-control-center (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1664438
Title:
updating device name in system settings doesn't update /etc/hosts
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