[Bug 1891952] Re: systemd-resolved not started when networking enabled

[William Wilson]

** Description changed:

  I was using friendly-recovery as my Ubuntu desktop session was not
  starting after an upgrade to Groovy Gorilla. When I chose to "Enable
  networking" in the friendly-recovery menu I noticed that no dns servers
  could be reached and come to find out it was because systemd-resolved
  did not start.
  
  Attached is a photo with some additional information.
+ 
+ [Impact]
+ 
+  * If a user has both systemd and resolvconf
+    installed, the networking option in friendly
+    recovery mode will not work correctly.
+ 
+  * In this scenario, /etc/resolv.conf will be
+    empty and dns resolution will not work
+ 
+ [Test Case]
+ 
+  * Ensure both systemd and resolvconf are installed
+ 
+  * Boot to friendly recovery mode and select the
+    network option from the menu
+ 
+  * Drop to a root shell by selecting the root shell
+    option from the menu.
+ 
+  * `cat /etc/resolv.conf` to make sure it is not
+     an empty file
+ 
+  * Run `dig www.google.com` to ensure dns resolution
+    works properly
+ 
+ [Where problems could occur]
+ 
+  * It is possible certain resolvconf or systemd-resolved
+    configurations could still conflict with each other
+ 
+  * This would be especially true if a user wanted to use
+    one nameserver service for a fully booted system and
+    a different service in friendly recovery mode
+ 
+  * If the nameserver is misconfigured in resolvconf or
+    network-manager, it will still be non-functional
+    in friendly recovery mode.

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https://bugs.launchpad.net/bugs/1891952

Title:
  systemd-resolved not started when networking enabled

Status in Release Notes for Ubuntu:
  Fix Released
Status in friendly-recovery package in Ubuntu:
  New
Status in friendly-recovery source package in Groovy:
  New

Bug description:
  I was using friendly-recovery as my Ubuntu desktop session was not
  starting after an upgrade to Groovy Gorilla. When I chose to "Enable
  networking" in the friendly-recovery menu I noticed that no dns
  servers could be reached and come to find out it was because systemd-
  resolved did not start.

  Attached is a photo with some additional information.

  [Impact]

   * If a user has both systemd and resolvconf
     installed, the networking option in friendly
     recovery mode will not work correctly.

   * In this scenario, /etc/resolv.conf will be
     empty and dns resolution will not work

  [Test Case]

   * Ensure both systemd and resolvconf are installed

   * Boot to friendly recovery mode and select the
     network option from the menu

   * Drop to a root shell by selecting the root shell
     option from the menu.

   * `cat /etc/resolv.conf` to make sure it is not
      an empty file

   * Run `dig www.google.com` to ensure dns resolution
     works properly

  [Where problems could occur]

   * It is possible certain resolvconf or systemd-resolved
     configurations could still conflict with each other

   * This would be especially true if a user wanted to use
     one nameserver service for a fully booted system and
     a different service in friendly recovery mode

   * If the nameserver is misconfigured in resolvconf or
     network-manager, it will still be non-functional
     in friendly recovery mode.

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