I needed to free up some space in bpool to add the latest patches to my Ubuntu 22.04 system running ZFS. I tried to ZFS destroy the oldest snapshot, and upon reboot, booting failed with the following:
Booting a command listerror: no such device: 9a3acf1a88182eec. Loading Linux 6.2.0-34-generic ... error: file '/BOOT/ubuntu_uad4uk@/vmlinuz-6.2.0-34-generic' not found Loading initial ramdisk ... error: you need to load the kernel first. Press any key to continue... How do I fix my system without destroying my data and rpool? What is the device 9a3acf1a88182eec? I am a long-time Unix (Solaris) user, but not very familiar with Ubuntu admin or grub.
I originally installed from the live disk, and it created bpool and rpool zfs pools, and boots from an EFI partition on a nvram disk.