Public bug reported:

1) on a »Ubuntu 16.04.4 LTS« with static ip configuration in 
/etc/network/interfaces and manual entries in /etc/resolv.conf
2) network-manager 1.2.6-0ubuntu0.16.04.2 is enabled but doesn’t manage any 
interfaces and therefore doesn’t start dnsmasq

3) using hostnamectl and updating /etc/hosts doesn’t break dns
resolution

4) changing the hostname however triggers NetworkManager to start
dnsmasq and overwrite /etc/resolv.conf

Workarounds are chattr’ing /etc/resolv.conf or – in this case –
disabling NetworkManager but i think this shouldn’t happen.


cat /etc/NetworkManager/NetworkManager.conf 
[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq

[ifupdown]
managed=false

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: xenial

** Package changed: dnsmasq (Ubuntu) => network-manager (Ubuntu)

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https://bugs.launchpad.net/bugs/1761986

Title:
  hostname change with static ip overwrites (manual) resolv.conf

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