[Bug 1765765] Re: on nfsboot 18.04 bionic, internet addresses arn't resolve properly

[Guillermo]

@beta-tester: Seems to work for me using 18.04.2

Here's my boot line (using iPXE):
kernel ${httpserver}/casper/vmlinuz root boot=casper keyboard-configuration/layoutcode=${layout} locale=${locale} netboot=cifs nfsroot=${server}${nfs_path} NFSOPTS=-ouser=guest,pass=guest,vers=2.0,ro ro

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https://bugs.launchpad.net/bugs/1765765

Title:
  on nfsboot 18.04 bionic, internet addresses arn't resolve properly

Status in casper package in Ubuntu:
  Confirmed

Bug description:
  since ubuntu 17.10, 18.04, when i nfsboot into ubuntu live an internet address isn't resolved properly.
  i always have to put a dns server to the /etc/resolv.conf file by hand to get address resolving to work again.

  it wasn't an issue in ubuntu 16.04 and not an issue in ubuntu 17.04.
  it began to be an issue starting with ubuntu 17.10 and ist still an issue now 18.04 daily-live.

  the different between /etc/resolv.conf of ubuntu <=17.04 and utuntu >=17.10 is, that now only one entry is in the resolv.conf file with IP 127.0.0.53
  in the erlier version there was an additional entry on top with the IP of the local DNS server(router).

  when i nfsboot ubuntu 18.04, adjust the /etc/resolv.conf file by hand to get internet address resolving to work,
  when i then install ubuntu 18.04 from that environment to the local harddrive, the networksettings on the newly installed local harddisk is always setted up to "manual" IP in the /etc/network/interfaces - so it will not get a proper IP from the router.
  after a new installation, i always have to set it up "dhcp" to get the IP from the router as usual.

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