trying to install mt7610u (linksys ae6000)

[Nachteule]

That's why I was asking which firmware file is needed.
Usually this will be logged in /var/log/syslog or if systemd has occupied logging you have to use systemd's journalctl
(don't know what ubuntu is using)
There is also a package called firmware-ralink - Binary firmware for Ralink wireless cards, maybe there is it