Hey @doktor60, indeed Etcher is supposed to unmount the USB / SD card once the flashing is done. Let us know if you are still having problem with it (your last message sounds like this works fine now)
Then, yes balena forum is not the best place to troubleshoot your wifi-adapter problems on Ubuntu 
Ubuntu is a popular OS among balena users so another forum user might chime in. But Iād suggest to ask your specific issue on a more Ubuntu focused forum as youāll get answers more quickly.
I have this problem too
Iām also on MacOS BigSur
Mounting and unmounting isnāt working for me. I did follow the steps to give it Full Disk Access, no luck
Hi there, could you please delete the Etcher app and reboot your mac. When it comes back, download the latest from etcher.io and (re)install. Try that as see how that goesā¦
Thanks for your reply!
I think we misunderstand each other. I was actually asking if the USB pen is supposed to unmount itself after it has been formatted. I did that manually and it worked. Flashing with etcher is just after this step.
And after flashing it unmounts itself 
And yeah, I think it all works at least okay now. The troubles are not so much with etcher.
Thanks to you all for assisting. Big up!
Hello,
Glad to see it worked out for you. You can also toggle etcherās unmount on flash behavior by using the settings cog present on the top right when you open balenaEtcher. Hope this helps!
Thanks!
Well the problem for me was unmounting BEFORE using etcher. So the settings in this app is not really useful for what I have been struggling with. Just to clarify
Answer is simple 
Use USB.2 port (not usb3) in your PC or Laptop to solove your problem.
