Found a solution which worked for me. If you use usb creator from ubuntu you need to choose the option "Discarded on shutdown, unless you save them elsewhere" at the bottom of the window. Then the usb key is created correctly and the installation works.
Found a solution which worked for me. If you use usb creator from ubuntu you need to choose the option "Discarded on shutdown, unless you save them elsewhere" at the bottom of the window. Then the usb key is created correctly and the installation works.