You are running the upgrade over a remote ssh connection with a frontend that does not support this. Please try a text mode upgrade with 'do-release-upgrade'. The upgrade will abort now. Please try without ssh.
Urruneko ssh konexio baten bidez bertsio-berritzen zabiltza, hau onartzen ez duen erabiltzaile-interfaze batekin. Saiatu testu-moduan bertsio-berritzen 'do-release-upgrade' aginduarekin. Bertsio-berritzea bertan behera geldituko da. Saiatu ssh gabe.