"My solution (reached independently) has been to disable the udev rule entirely: sudo mv /etc/udev/rules.d/85-ifupdown.rules /etc/udev/rules.d/85-ifupdown.rules.bak"
I can confirm this solved the issue.
"My solution (reached independently) has been to disable the udev rule entirely: rules.d/ 85-ifupdown. rules /etc/udev/ rules.d/ 85-ifupdown. rules.bak"
sudo mv /etc/udev/
I can confirm this solved the issue.