I just solved this for my system. Hopefully people encountering this have an existing bootable kernel from before the upgrade. If so, use that to boot into the system then run:
sudo apt install cryptsetup cryptsetup-initramfs sudo update-initramfs -c -k [kernel version needing fixing] eg sudo update-initramfs -c -k 6.8.0-49-generic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2067913 Title: after 23.10 to 24.04 upgrade zfs encrypted boot drive won't decrypt To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/2067913/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs