[Bug 2092945] Re: upgrade from 22 to 24 broke static ip

[Nick Rosbrook]

** Package changed: ubuntu-release-upgrader (Ubuntu) => systemd (Ubuntu)

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https://bugs.launchpad.net/bugs/2092945

Title:
  upgrade from 22 to 24 broke static ip

Status in systemd package in Ubuntu:
  New

Bug description:
  In the past week, I upgraded three machines using do-release-upgrade from Ubuntu server 22 to 24.
  All had static IPs configured:
  #1 with /etc/network/interfaces (oldschool!) (hostname=ocelot)
  #2 /etc/netplan/00-installer-config.yaml (as originally created by subiquity) (hostname=toolbox)
  #3 /etc/netplan/90-config.yaml (hostname=couch)

  All were simple (physical) configurations: just one ethernet interface, one network. (plus docker in #2-3, plus some ppp's in #3). #3 also had multiple IPs bound to eth0 (to enable routing by source ip addr)
  #1-2 are running as a vm under the same xen hypervisor (ubuntu 22.04.3), #3 runs bare-metal (dell xeon)

  In cases #1-2, the config file was NOT updated from 'eth0' to 'enX0' and the machine did not come back on the network. Luckily, I had access to the console, or I'd be screwed. 
  In case #3, 'eth0' is still the configured interface.

  So... I guess it's xen related, then? Note the hypervisor (host os)
  did not change, only the guest vm was upgraded from 22 to 24.

  #1 hvm
  ```
  $ cat ocelot.hvm
  builder = "hvm"
  name = "ocelot-hvm"
  memory = "1024"
  vcpus = 1
  vif = ['']
  #disk = ['phy:/dev/lvg/ocelot-root,hda,w','file:/root/dmg/ubuntu-16.04.3-server-amd64.iso,hdc:cdrom,r'] # lol, long upgrade history here!
  disk = ['phy:/dev/lvg/ocelot-root,hda,w']
  vnc = 1
  boot="dc"
  ```

  #2 hvm
  ```
  $ cat toolbox.hvm 
  builder = "hvm"
  name = "toolbox-hvm"
  memory = "3072"
  vcpus = 1
  vif = ['']
  #disk = ['phy:/dev/lvg/toolbox-root,hda,w','file:/root/dmg/ubuntu-20.04.4-live-server-amd64.iso,hdc:cdrom,r']
  disk = ['phy:/dev/lvg/toolbox-root,hda,w']
  vnc = 1
  boot="dc"
  ```

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