I've also had this problem with both an imac mid 2011 and late 2013. Booting 25.04 using an iso written to a usb drive also fails to boot.
It seems people have this with macbooks, imacs and mac minis. I think there is an open bug for this: Bug #2105402 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2109478 Title: upgrade to 25.04 (plucky) finished, but boot failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2109478/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
