[Bug 1881832] [NEW] Ubuntu server 20.04 fails to get IP address from DHCP server (no network connectivity)

[psl]

Public bug reported:

Ubuntu 20.04 server amd64, running as virtual machine on FreeNAS-11.3-U3.2.
Network interface was configured with driver VirtIO, and network interface is bridged at FreeNAS.

The issue is that I have DHCP server in my LAN and Ubuntu installer gets
IPv4 address and applies updates from internet. Install process is OK.
Once installation is finished, reboot is required but Ubuntu will not
start, EFI issue has to be fixed first; Ubuntu on FreeNAS has problem
with EFI, it has to be manually fixed; it is known issue, solution is
here: https://www.ixsystems.com/community/threads/howto-how-to-boot-
linux-vms-using-uefi.54039/

Once EFI is fixed and Ubuntu boots, no IP address is assigned to enp0s4
interface, so Ubuntu 20.04 server has no network connectivity. I can
manually force IP address allocation with command "sudo dhclient enp0s4"
and it works but that is just a workaround. IP address should be
allocated automatically during server boot...

I have older Ubuntu machines on the same FreeNAS box and those work
fine, so I assume there is a bug in Ubuntu 20.04 and DHCP client is
broken or not reliable... :-( Some problem in netplan utility??

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1881832

Title:
  Ubuntu server 20.04 fails to get IP address from DHCP server (no
  network connectivity)

Status in netplan.io package in Ubuntu:
  New

Bug description:
  Ubuntu 20.04 server amd64, running as virtual machine on FreeNAS-11.3-U3.2.
  Network interface was configured with driver VirtIO, and network interface is bridged at FreeNAS.

  The issue is that I have DHCP server in my LAN and Ubuntu installer
  gets IPv4 address and applies updates from internet. Install process
  is OK. Once installation is finished, reboot is required but Ubuntu
  will not start, EFI issue has to be fixed first; Ubuntu on FreeNAS has
  problem with EFI, it has to be manually fixed; it is known issue,
  solution is here: https://www.ixsystems.com/community/threads/howto-
  how-to-boot-linux-vms-using-uefi.54039/

  Once EFI is fixed and Ubuntu boots, no IP address is assigned to
  enp0s4 interface, so Ubuntu 20.04 server has no network connectivity.
  I can manually force IP address allocation with command "sudo dhclient
  enp0s4" and it works but that is just a workaround. IP address should
  be allocated automatically during server boot...

  I have older Ubuntu machines on the same FreeNAS box and those work
  fine, so I assume there is a bug in Ubuntu 20.04 and DHCP client is
  broken or not reliable... :-( Some problem in netplan utility??

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