Purging Docker May Have Nuked My Ethernet? (Actually it was ACPI)
[ 1.241057] e1000e 0000:00:1f.6: can't find IRQ for PCI INT A; please try using pci=biosirq
[ 1.243023] e1000e 0000:00:1f.6: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
[ 2.533297] e1000e: probe of 0000:00:1f.6 failed with error -2
A recent search finds this: https://www.whtop.com/blog/e1000e-probe-failed-with-error-2/ I suggest that you try a boot parameter acpi=off
following this guide: https://wiki.ubuntu.com/Kernel/KernelBootParameters
You have confirmed above that this resolves the issue.
I'm glad it's now working as expected.