before trying the network activation to see if you get any kind of helpful warning or error messages after doing so. similarly you could try unplugging the adapter, running
dmesg -w
and then plugging the adapter back in. fair warning: dmesg produces a lot of output. in this instance you only need to concern yourself with the output after plugging the adapter back in. again you would be looking for any errors or warnings that you could run a web search for to see if there are any solutions.