Ethernet won't connect when cable is plugged in at boot
I've reported this bug here: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1826403 where I was asked to raise this upstream on this forum. The text below is a copy and paste of the bug reported at launchpad.net.
When booting Ubuntu 19.04 with the Ethernet cable plugged in, after boot, network manager won't connect. Unplugging and plugging back in the cable with the system running doesn't work to establish a connection.
The workaround is to boot with the cable unplugged, then to plug it in after boot.
This problem emerged immediately following an upgrade from 18.10 to 19.04. On the first boot networking was fine, but from the first reboot a networking connection through the Ethernet cable couldn't be established if the cable was plugged in at boot.
This issue is also described here: https://askubuntu.com/questions/1135412/updated-to-19-04-and-no-ethernet-now/1135726#1135726 and here: https://ubuntu-mate.community/t/19-04-ethernet-wired-connection-refuses-to-connect-when-plugged-in-before-boot/19333/6
ProblemType: Bug DistroRelease: Ubuntu 19.04 Package: network-manager 1.16.0-0ubuntu2 ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6 Uname: Linux 5.0.0-13-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.10-0ubuntu27 Architecture: amd64 CurrentDesktop: GNOME Date: Thu Apr 25 21:50:27 2019 IfupdownConfig:
interfaces(5) file used by ifup(8) and ifdown(8)
auto enp4s0f1 auto lo iface lo inet loopback InstallationDate: Installed on 2018-11-23 (153 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) IpRoute: default via 192.168.11.1 dev enp4s0f1 proto dhcp metric 100 169.254.0.0/16 dev enp4s0f1 scope link metric 1000 192.168.11.0/24 dev enp4s0f1 proto kernel scope link src 192.168.11.13 metric 100 NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=false WWANEnabled=true SourcePackage: network-manager UpgradeStatus: Upgraded to disco on 2019-04-25 (0 days ago) mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2019-04-25T20:03:28.380204 nmcli-dev: DEVICE TYPE STATE IP4-CONNECTIVITY IP6-CONNECTIVITY DBUS-PATH CONNECTION CON-UUID CON-PATH enp4s0f1 ethernet connected full limited /org/freedesktop/NetworkManager/Devices/2 Automatic connection e906293b-df71-435b-8909-7d88ca006540 /org/freedesktop/NetworkManager/ActiveConnection/1 wlp3s0 wifi unavailable limited limited /org/freedesktop/NetworkManager/Devices/3 -- -- -- lo loopback unmanaged unknown unknown /org/freedesktop/NetworkManager/Devices/1 -- -- -- nmcli-nm: RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN running 1.16.0 connected started full enabled enabled disabled enabled enabled