#StackBounty: #boot #grub2 #upgrade #kernel #20.04 ZFS doesn't allow me to follow kernels with updates

Bounty: 150

I installed ubuntu 20.04 sometime in june.

by now I’m updated to ubuntu 20.04.1 LTS

there’s been a few kernel updates. end everytime I run updates Zsys tries to put new kernel version as the first option.

And I’d like nothing more but to use the new kernels.

but they simply won’t boot.

when I say won’t boot, I mean some kinda freeze happens during the boot process I can’t drop to TTY/boot command line and I don’t get any error messages (maybe I’m not hitting the right key)

I just have my motherboard logo and that’s it.

the ubuntu logo and spinner don’t show up and it could stay like this indefinitely if I did nothing.

luckily i still have my old grub entry and with grub customizer I’ve been keeping it at the top of the list.

but I want to solve this issue now before ubuntu decides I’ve been hoarding an old kernel for too long.

is there something in particular I’m supposed to do to boot a new kernel with ZFS?

I’m guessing it has nothing to do with the specific kernel version and more to do with zfs being a block that’s not yet intricately tied into the rest of the OS. and where ubuntu is able to automatically update the kernel references everywhere else it doesn’t yet automatically update a variable inside ZFS that points to the kernel version, or something like that?

I don’t know.

Anyways :

t@tsu:~$ dpkg -l | tail -n +6 | grep -E 'linux-image-[0-9]+'
ii  linux-image-5.4.0-40-generic                                5.4.0-40.44                                                 amd64        Signed kernel image generic
ii  linux-image-5.4.0-45-generic                                5.4.0-45.49                                                 amd64        Signed kernel image generic
ii  linux-image-5.4.0-47-generic                                5.4.0-47.51                                                 amd64        Signed kernel image generic

5.4.0-40 boots and is the one my ubuntu 20.04 installed with

5.4.0-45 does not boot and was installed by updates not by me

5.4.0-47 does not boot and was installed by updates not by me

Ideally I’d like to boot 5.4.0-47

EDIT :

On kernel installs I do get an error :

Setting up linux-modules-5.4.48-050448-generic (5.4.48-050448.202006220832) ...
Setting up linux-image-unsigned-5.4.48-050448-generic (5.4.48-050448.202006220832) ...
I: /boot/vmlinuz.old is now a symlink to vmlinuz-5.4.0-47-generic
I: /boot/initrd.img.old is now a symlink to initrd.img-5.4.0-47-generic
I: /boot/vmlinuz is now a symlink to vmlinuz-5.4.48-050448-generic
I: /boot/initrd.img is now a symlink to initrd.img-5.4.48-050448-generic
Processing triggers for linux-image-unsigned-5.4.48-050448-generic (5.4.48-050448.202006220832) ...
/etc/kernel/postinst.d/dkms:
 * dkms: running auto installation service for kernel 5.4.48-050448-generic
   ...done.
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-5.4.48-050448-generic
I: The initramfs will attempt to resume from /dev/sda2
I: (UUID=53c19176-f03e-4c40-a6ed-3a2627160647)
I: Set the RESUME variable to override this.
/etc/kernel/postinst.d/zz-update-grub:
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...

and a ton of these :

Warning: Couldn't find any valid initrd for dataset rpool/ROOT/ubuntu_38tazy@autozsys_7lfyl1.

and here’s update-grub :

(doesn’t look optimal)

https://pastebin.com/8y6x36u4


Get this bounty!!!

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