Public bug reported:

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu Bionic Beaver (development branch)
Release:        18.04
Codename:       bionic

$ uname -a
Linux alex-VirtualBox2 4.15.0-13-generic #14-Ubuntu SMP Sat Mar 17 13:44:27 UTC 
2018 x86_64 x86_64 x86_64 GNU/Linux


$ apt-cache policy network-manager
network-manager:
  Installed: 1.10.6-2ubuntu1
  Candidate: 1.10.6-2ubuntu1
  Version table:
 *** 1.10.6-2ubuntu1 500
        500 http://au.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

$ apt-cache policy dnsmasq
dnsmasq:
  Installed: (none)
  Candidate: 2.79-1
  Version table:
     2.79-1 500
        500 http://au.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        500 http://au.archive.ubuntu.com/ubuntu bionic/universe i386 Packages


Once I set:
[main]
plugins=ifupdown,keyfile
dns=dnsmasq # <- this line was added
...

DNS resolving stops to work.

$ ping google.com.au
ping: google.com.au: Temporary failure in name resolution

$ nslookup google.com.au
Server:         127.0.0.53
Address:        127.0.0.53#53

** server can't find google.com.au: SERVFAIL


it's only one setting I changed. /etc/NetworkManager/dnsmasq.d folder is empty.

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

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1764025

Title:
  Network manager doesn't work with option: dns=dnsmasq

Status in network-manager package in Ubuntu:
  New

Bug description:
  $ lsb_release -a
  No LSB modules are available.
  Distributor ID:       Ubuntu
  Description:  Ubuntu Bionic Beaver (development branch)
  Release:      18.04
  Codename:     bionic

  $ uname -a
  Linux alex-VirtualBox2 4.15.0-13-generic #14-Ubuntu SMP Sat Mar 17 13:44:27 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

  
  $ apt-cache policy network-manager
  network-manager:
    Installed: 1.10.6-2ubuntu1
    Candidate: 1.10.6-2ubuntu1
    Version table:
   *** 1.10.6-2ubuntu1 500
          500 http://au.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

  $ apt-cache policy dnsmasq
  dnsmasq:
    Installed: (none)
    Candidate: 2.79-1
    Version table:
       2.79-1 500
          500 http://au.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
          500 http://au.archive.ubuntu.com/ubuntu bionic/universe i386 Packages


  
  Once I set:
  [main]
  plugins=ifupdown,keyfile
  dns=dnsmasq # <- this line was added
  ...

  DNS resolving stops to work.

  $ ping google.com.au
  ping: google.com.au: Temporary failure in name resolution

  $ nslookup google.com.au
  Server:               127.0.0.53
  Address:      127.0.0.53#53

  ** server can't find google.com.au: SERVFAIL

  
  it's only one setting I changed. /etc/NetworkManager/dnsmasq.d folder is 
empty.

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