I tested this today using the 2021-10-07 ubuntu-mate ISO in qemu and I did see the message regarding removing installation media and pressing "ENTER". I saw the message regardless of whether I choose "Try Ubuntu" or installed immediately.
I tested this today using the 2021-10-07 ubuntu-mate ISO in qemu and I did see the message regarding removing installation media and pressing "ENTER". I saw the message regardless of whether I choose "Try Ubuntu" or installed immediately.