The current version of ubuntu 21.04 will not boot from live dvd: https://askubuntu.com/questions/1336515/ubuntu-21-4-desktop-iso-burned-to-dvd-fails-to-start https://news.itsfoss.com/ubuntu-21-04-upgrade-bug/ https://ubuntu-mate.community/t/ubuntu-mate-21-04-live-does-not-boot/24010
Please contact the ubuntu technician: mark.cunning...@canonical.com So us users can get this problem resolved. Many Thanks Mark.
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