errors when installing ZFS (openzfs)

[petesimon]

Thanks very much for your work Mr. Devmfc ☺. I successfully installed (message post here) ubuntu plucky 6.12.30 on a s905w2 tv box. Years ago, I had used ZFS in full ubuntu on an Intel PC before, so I want to try ZFS and connect a USB hard drive on my tv box for tinkering and learning purposes. So, ZFS needs linux-headers that match the current kernel version 6.12.30-meson64 but unfortunately, that doesn't exist or at least I can't find it and install it. However, there are many instances of linux-headers-6.14.xx. So, as first step to get linux-headers-6.14.xx, I as root user (su -l root) I tried to upgrade the kernel to a 6.14 generic but it failed and i got the errors:

Failed to create symlink to vmlinuz-6.14.0-22-generic: Operation not permitted at /usr/bin/linux-update-symlinks line 64.
dpkg: error processing package linux-image-6.14.0-22-generic (--configure):
installed linux-image-6.14.0-22-generic package post-installation script subprocess returned error exit status 1

After I got those errors, i rebooted and i saw that the default kernel 6.12.30-meson64 is still installed and working.

My questions are:

1. How do I install linux-headers (or source?) for 6.12.30-meson64 ?
2. If question 1 isn't possible, then how do i upgrade the kernel to any 6.14.xx generic via apt install or another method ?

[devmfc]

It is just in the released files section?

linux-headers-6.12.30-meson64_20250522_arm64.deb

Install with apt-get install ./linux-headers-6.12.30-meson64_20250522_arm64.deb

You can never use the headers of another kernel...

[petesimon]

It is just in the released files section?
linux-headers-6.12.30-meson64_20250522_arm64.deb
Install with apt-get install ./linux-headers-6.12.30-meson64_20250522_arm64.deb

Okay. Thanks. But please refer to my post above: I tried to upgrade the kernel to a 6.14 generic but it failed and i got the errors ...

A few days ago, I ran this command sudo apt install -y linux-image-6.14.0-22-generic and it failed and I got errors:

Failed to create symlink to vmlinuz-6.14.0-22-generic: Operation not permitted at /usr/bin/linux-update-symlinks line 64.
dpkg: error processing package linux-image-6.14.0-22-generic (--configure):
installed linux-image-6.14.0-22-generic package post-installation script subprocess returned error exit status 1

Now I can't remove linux-image-6.14.0-22-generic and can't install any new packages. The apt and apt-get always make those same errors and fail.

For example sudo apt install -y less and sudo apt remove -y less both do not work; they fail, giving the same error and more errors as written above.

What can I do other than delete everything and reinstall the O.S. image?