Public bug reported:

After performing an autoinstall with Ubuntu Server ISO and rebooting,
trying to automate the installation of ubuntu-desktop-minimal causes DNS
settings to be lost.

For our specific use-case, we are installing ubuntu server (fully automated), 
then using Puppet to install desktop packages. This was working without any 
manual interaction previously on both Ubuntu 22.04 and 24.04
For the last week or so, deployments of 24.04 (22.04 is still fine) are getting 
stuck after installing ubuntu-desktop-minimal. The DNS server settings are 
lost, but IP connectivity remains.


Step-by-step
1) Install Ubuntu Server with default network configuration using autoinstall.
2) Reboot and install network-manager (note that everything is still working 
normally)
3) Install ubuntu-desktop-minimal

DNS settings are now lost on the primary interface, yet IP connectivity
remains. networkd is still managing the interface, but "netplan get"
reports that NetworkManager is the current renderer.

```
network:
  version: 2
  renderer: NetworkManager
  ethernets:
    enp1s0:
      critical: true
      nameservers:
        addresses:
        - 172.16.1.100
        - 172.18.1.100
      dhcp-identifier: "mac"
      dhcp4: true
```


We can workaround the problem forcing an extra reboot after installing 
ubuntu-desktop-minimal. But previously this workflow was fine without rebooting 
until the very end of the config.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: systemd 255.4-1ubuntu8.5
ProcVersionSignature: Ubuntu 6.8.0-52.53-generic 6.8.12
Uname: Linux 6.8.0-52-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.3
Architecture: amd64
CasperMD5CheckResult: pass
CloudArchitecture: x86_64
CloudID: none
CloudName: none
CloudPlatform: none
CloudSubPlatform: config
Date: Mon Feb 10 10:47:43 2025
InstallationDate: Installed on 2025-02-10 (0 days ago)
InstallationMedia: Ubuntu-Server 24.04.1 LTS "Noble Numbat" - Release amd64 
(20240827)
Lsusb: Error: command ['lsusb'] failed with exit code 1:
Lsusb-t:
 
Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1:
MachineType: VMware, Inc. VMware7,1
ProcEnviron:
 LANG=en_GB.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-52-generic 
root=/dev/mapper/vg00-root ro
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: systemd
SystemdFailedUnits:
 Error: command ['systemctl', 'status', '--full', '●'] failed with exit code 4: 
Invalid unit name "●" escaped as "\xe2\x97\x8f" (maybe you should use 
systemd-escape?).
 Unit \xe2\x97\x8f.service could not be found.
 ------
 Error: command ['systemctl', 'status', '--full', '●'] failed with exit code 4: 
Invalid unit name "●" escaped as "\xe2\x97\x8f" (maybe you should use 
systemd-escape?).
 Unit \xe2\x97\x8f.service could not be found.
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/25/2021
dmi.bios.vendor: VMware, Inc.
dmi.bios.version: VMW71.00V.18227214.B64.2106252220
dmi.board.name: 440BX Desktop Reference Platform
dmi.board.vendor: Intel Corporation
dmi.board.version: None
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnVMware,Inc.:bvrVMW71.00V.18227214.B64.2106252220:bd06/25/2021:svnVMware,Inc.:pnVMware7,1:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:sku:
dmi.product.name: VMware7,1
dmi.product.version: None
dmi.sys.vendor: VMware, Inc.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug noble

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https://bugs.launchpad.net/bugs/2097769

Title:
  Installation of ubuntu-desktop-minimal breaks DNS

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