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.
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.