Public bug reported:

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?

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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

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

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