Sounds like https://bugs.launchpad.net/ubuntu/+source/ubuntu-release- upgrader/+bug/1924752/comments/6? Can you please check?
> On upgrading to Ubuntu 21.04 on both my MacBook and iMac after the intro > music > nothing happens. Left with a frozen blank screen. Only way out is to hold the > power button. Using efi boot. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1926181 Title: Ubuntu 21.04 boot fails on MacBook and iMac To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1926181/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
