Hi
If you have active uplink interfaces then you go into network interfaces and try to remove one of the uplink interface you have a first message which tell that interface is a used object and if we want to proceed... but if we want to continue we have another message complaining about the values we entered are bad... (see attached screenshot)..
if we want to proceed this has to do the job:
- so removing uplink stuff and replace things with the last iface if there is only one remaining interface...
thx