Public bug reported:

For the past few days, the LAN connection has been lost after starting
the PC. I then always have to switch the “wired” connection off and on
again.

lsb_release -rd
Description:    Ubuntu 25.04
Release:        25.04

apt-cache policy network-manager
network-manager:
  Installiert:           1.52.0-1ubuntu1
  Installationskandidat: 1.52.0-1ubuntu1
  Versionstabelle:
 *** 1.52.0-1ubuntu1 500
        500 http://de.archive.ubuntu.com/ubuntu plucky/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 25.04
Package: network-manager 1.52.0-1ubuntu1
ProcVersionSignature: Ubuntu 6.14.0-28.28-generic 6.14.8
Uname: Linux 6.14.0-28-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.32.0-0ubuntu5.3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Aug 22 23:47:54 2025
InstallationDate: Installed on 2025-04-26 (118 days ago)
InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Release amd64 (20250415.3)
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
ProcEnviron:
 LANG=de_DE.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
RfKill:
 
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-nm:
 RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  WIFI  
   WWAN-HW  WWAN     METERED      
 running  1.52.0   connected  started  full          enabled     missing  
enabled  missing  enabled  no (guessed)

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug plucky

** Attachment removed: "IpRoute.txt"
   
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/2121259/+attachment/5901483/+files/IpRoute.txt

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https://bugs.launchpad.net/bugs/2121259

Title:
  LAN connection lost after startup

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