[Bug 1723803] [NEW] Enable Networking fails DNS configuration with systemd-resolved

[Nicolas Michel]

Public bug reported:

I'm testing Ubuntu 17.10. The DNS is not well configured when choosing
"enable networking".

Steps to reproduce
------------------
- Choose recovery mode from grub
- choose "enable networking"
- Choose "drop to root shell prompt"
- You can test name resolution with ping www.google.com or apt update. It fails.

Explanation
-----------
- /etc/resolv.conf is a symlink to /var/run/systemd/resolve/resolv.conf
- The file is configured to use the local DNS forwarder made available by the systemd-resolved service
- In recovery mode, systemd-resolved service is not started and trying to start it by hand doesn't seem to work

Workaround
----------
Replace the symlink /etc/resolv.conf by a text file and configure a known working DNS. For example:
nameserver 8.8.8.8

** Affects: friendly-recovery (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1723803

Title:
  Enable Networking fails DNS configuration with systemd-resolved

Status in friendly-recovery package in Ubuntu:
  New

Bug description:
  I'm testing Ubuntu 17.10. The DNS is not well configured when choosing
  "enable networking".

  Steps to reproduce
  ------------------
  - Choose recovery mode from grub
  - choose "enable networking"
  - Choose "drop to root shell prompt"
  - You can test name resolution with ping www.google.com or apt update. It fails.

  Explanation
  -----------
  - /etc/resolv.conf is a symlink to /var/run/systemd/resolve/resolv.conf
  - The file is configured to use the local DNS forwarder made available by the systemd-resolved service
  - In recovery mode, systemd-resolved service is not started and trying to start it by hand doesn't seem to work

  Workaround
  ----------
  Replace the symlink /etc/resolv.conf by a text file and configure a known working DNS. For example:
  nameserver 8.8.8.8

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