Post BIOS Update

Overview

Index of Issues

Ethernet card change it's ID causing the networkctl to be unable to start.
Windows Decided to update the EFI boot entry, causing the systemd-boot to be ignored
Secure Boot keys were lost, preventing Arch Linux from booting.

Fixes

Ethernet Card ID Change Fix

Step 1: Check networkctl

Check the status of the network interfaces using:

networkctl list

Which might look something like this:

IDX LINK     TYPE     OPERATIONAL SETUP     
lo       loopback carrier     unmanaged
eno1     ether    off         unmanaged
wlp101s0 wlan     off         unmanaged
enp99s0  ether    degraded    unmanaged

Capture the name of the device that is degraded, in this case enp99s0.

Step 2: Verify it has the same IDX as in /etc/systemd/network/20-wired.network

Open in an editor: /etc/systemd/network/20-wired.network

This should look something like:

[Match]
# Name=enp10s0
Name=enp99s0

[Network]
DHCP=yes

If Name= is different from the IDX captured in step 1, update it to match.

Step 3: Restart systemd-networkd

Restart the network service to apply the changes:

sudo systemctl restart systemd-networkd