Fixed - The symlink of resolv.conf was wrong. The following shows how - 
resolv.conf-BAK was the old, broken one, resolv.conf the one I fixed. I don't 
know how that happened, but I have installed the 18.04 beta version, may that 
was the reason.
 
lrwxrwxrwx   1 root root       32 Mai 29 10:55 resolv.conf -> 
/run/systemd/resolve/resolv.conf
lrwxrwxrwx   1 root root       39 Apr  9 12:26 resolv.conf-BAK -> 
../run/systemd/resolve/stub-resolv.conf

** Changed in: network-manager (Ubuntu)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1762984

Title:
  DNS resolving not working due to wrong entry in resolv.conf

Status in network-manager package in Ubuntu:
  Fix Committed

Bug description:
  In my ``/etc/resolv.conf`` I have the entry:

  ```
  nameserver 127.0.0.53
  ```

  I'm connected to the network via WIFI.
  My IP is ``192.168.0.31``

  The network-manager applet shows me automatic DNS configuration and a DNS 
server of 192.0.0.1, which is correct.
  Changing DNS configuration in the network-manager applet to manual and 
editing it there doesn't work either.

  I have to edit the resolv.conf file in order to get DNS resolving
  work.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: network-manager 1.10.6-2ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr 11 11:51:58 2018
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2018-04-09 (1 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
  IpRoute:
   default via 192.168.0.1 dev wlp1s0 proto dhcp metric 20600 
   169.254.0.0/16 dev wlp1s0 scope link metric 1000 
   192.168.0.0/24 dev wlp1s0 proto kernel scope link src 192.168.0.31 metric 600
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-con:
   NAME         UUID                                  TYPE  TIMESTAMP   
TIMESTAMP-REAL                AUTOCONNECT  AUTOCONNECT-PRIORITY  READONLY  
DBUS-PATH                                   ACTIVE  DEVICE  STATE      
ACTIVE-PATH                                         SLAVE 
   NSACIAGCHQ5  f8431fbb-6f3c-4848-bcc4-4449012df3f7  wifi  1523440039  Mi 11 
Apr 2018 11:47:19 CEST  yes          0                     no        
/org/freedesktop/NetworkManager/Settings/2  yes     wlp1s0  activated  
/org/freedesktop/NetworkManager/ActiveConnection/1  --    
   welansepp    af2f9fd1-2a81-4e2c-95e5-3f4e9a9997b9  wifi  1523402504  Mi 11 
Apr 2018 01:21:44 CEST  yes          0                     no        
/org/freedesktop/NetworkManager/Settings/1  no      --      --         --       
                                           --
  nmcli-dev:
   DEVICE  TYPE      STATE      DBUS-PATH                                  
CONNECTION   CON-UUID                              CON-PATH                     
                      
   wlp1s0  wifi      connected  /org/freedesktop/NetworkManager/Devices/2  
NSACIAGCHQ5  f8431fbb-6f3c-4848-bcc4-4449012df3f7  
/org/freedesktop/NetworkManager/ActiveConnection/1 
   lo      loopback  unmanaged  /org/freedesktop/NetworkManager/Devices/1  --   
        --                                    --
  nmcli-nm:
   RUNNING  VERSION  STATE                  STARTUP  CONNECTIVITY  NETWORKING  
WIFI-HW  WIFI     WWAN-HW  WWAN    
   running  1.10.6   connected (site only)  started  limited       enabled     
enabled  enabled  enabled  enabled

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