I have recently built a Ubuntu Core 24 based image for Raspberry Pi based hardware. After booting I see that eth0 has been renamed to end0.
It seems to be suggested (for Non Ubuntu COre systems) that putting net.ifnames=0 in /boot/cmdline.txt will revert this.
This solution doesnt work on Ubuntu Core. Is there an alternative mechanism to disable this “Predictable Interface Names” mechanism.
It used to (it works in Core22) 
but seems systemd dropped support for it, though I can’t actually find with which version but it looks like the documentation referring to it:
https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/
has been deprecated about a year ago in favor of:
https://www.freedesktop.org/software/systemd/man/latest/systemd.net-naming-scheme.html
To configure this feature, is it correct to change the cmdline.txt-core in the gadget snap source which end up in /run/mnt/ubuntu-seed/cmdline.txt on the imaged system?
There are other instances of cmdline.txt on the imaged system , not all identical.
Also should changing it and rebooting be enough or does the gadget snap need to rebuilt and the device re-imaged?
As I understand the doc you need to use a udev rule in the the new world, but yes, cmdline changes should go into the -core file afaik
