Hmm, actually the default configuration on these images does appear to contain an error. From the debconf database:
> Name: grub-pc/install_devices > Template: grub-pc/install_devices > Value: /dev/sda > Owners: grub-pc > Flags: seen The correct device on newer EC2 instances would be /dev/nvme0n1. Jeff Turner might be onto something here. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1889509 Title: grub boot error : "symbol 'grub_calloc' not found To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1889509/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs