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You can't permanently override the read-only nature of your system. You can create a temporary overlay that allows you to edit certain directories like /usr and /etc, but you can't create something persistent. It will revert on reboot, and you'll have a broken installation of your Garmin software.
Iirc, doesn't /var/etc exist? Can you place what you need there instead?
I'll try /var/etc and let you know. But besides that am I understanding you correctly that nothing at all will be persistant? Even the overlay will reset itself?
Edit: /var doesn't have an etc folder and it's also in the read only section. Also, home/username/.var doesn't have an etc folder either
so you want to run an immutable distro, but make it not immutable. i'm not sure that's a good idea. maybe you reached its limitations.
I simply wanted to add one config file and keep it immutable
Probably gonna need to use distrobox, rather than install on the immutable os.