A start job is running for Wait for Network to be Configured

Recently installed Ubuntu Server 22.04 on an ODroid H2 (which has 2 2.5gbe ports), and every time the server reboots there's a 2 min pause with the message "A start job is running for Wait for Network to be Configured" while it counts up.

Luckily, it's an easy fix

Apparently the installer adds both interfaces to the netplan, so it happily waits for DHCP to assign a network address for the full two minutes (even if there's no ethernet cable attached)

To fix, edit /etc/netplan/00-installer-config.yaml and remove the interface you're not using.

For example, the file contents will look like the following:

# This is the network config written by 'subiquity'
network:
  ethernets:
    enp2s0:
      dhcp4: true
    enp3s0:
      dhcp4: true
  version: 2

Since there is only a network cable connected to 'enp2s0', we can simply remove the 'enp3s0' lines. (note: only changing the dhcp4 value to 'false' does NOT resolve the issue, removing the lines does)

Broken signatures

What happens if you leave an Ubuntu machine running for a couple years and then try to update? Sometimes signatures expire...

Err:6 http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/1.19/xUbuntu_20.04  InRelease
  The following signatures were invalid: EXPKEYSIG 4D64390375060AA4 devel:kubic OBS Project <devel:kubic@build.opensuse.org>

To resolve: (from https://github.com/containers/podman.io/issues/296#issuecomment-1455207534)

wget -qO - https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_22.04/Release.key | sudo apt-key add -

Err:3 https://packages.cloud.google.com/apt kubernetes-xenial InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B53DC80D13EDEF05

To resolve: (from https://github.com/kubernetes/release/issues/1982#issuecomment-1415573798)

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | gpg --dearmor | sudo dd status=none of=/usr/share/keyrings/kubernetes-archive-keyring.gpg
echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt update