[Bug 1937869] Re: not able to SSH access a server after bridge-utils was removed

[Patricia Domingues]

I know it could be a special case where bridge-utils was not manually
installed and you are still using ENI instead of netplan, but other
people may hit the same problem

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https://bugs.launchpad.net/bugs/1937869

Title:
  not able to SSH access a server after bridge-utils was removed

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  I've upgraded a server via `do-release-upgrade` from Ubuntu Bionic to
  Focal. It was ENI configured (since Ubuntu 12.04 Precise): 

  ```
  auto lo
  iface lo inet loopback

  # The primary network interface
  iface eth0 inet manual

  # The primary bridge interface
  auto br0
  iface br0 inet static
   address 10.230.71.10
   netmask 255.255.248.0
   gateway 10.230.64.1
   bridge_ports eth0
   dns-nameservers 10.230.64.1
  ```

  and I lost SSH access to the system after the upgrade was completed
  because bridge-utils was removed during the last upgrade phase:

  ```Remove obsolete packages? 
  187 packages are going to be removed.
  ...
  Removing bridge-utils (1.6-2ubuntu1) ...
  ```
  I think the reason was because `bridge-utils` was automatically installed, probably via `libvirt-bin`, but is this correct - a automatically package cleanup happening in an "obsolete removal" phase?

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