Upgraded my Pi3B from buster to bullseye, but kernel is still 6.1.21. [SOLVED]
Edit: The solution in my case was to run these commands:
```
sudo apt update
sudo apt install linux-image-rpi-v8 linux-headers-rpi-v8
```
The new kernel wasn't used after rebooting though, so I had to edit /boot/config.txt and add:
```
# New kernel (test)
kernel=vmlinuz-6.12.75+rpt-rpi-v8
initramfs initrd.img-6.12.75+rpt-rpi-v8 followkernel
```
I'll figure out how to make it so I don't have to manually keep config.txt updated but for now, I'm happy to have a process to stay up to date with current kernels.
/edit
Reading about the latest [Copy Fail security vulnerability](https://discourse.ifin.network/t/copy-fail-732-bytes-to-root-on-every-major-linux-distributions/342) I realised I was overdue a check on my system. It turns out I had even bigger problems - I was still on Debian 10/Buster.
To solve it I updated my apt list to contain:
deb http://archive.raspberrypi.org/debian/ bookworm main
But after doing this, updating and doing a full upgrade, my kernel is still 6.1.21.
I'm now reading that I should not have upgraded from bullseye to bookworm, so what is the easiest way forward from here? If there is a documented set of steps for this scenario I'd appreciate a link. I have a lot of services and scripts so reinstalling from scratch is not really an option.
`uname -a`
`Linux 6.1.21-v8+ #1642 SMP PREEMPT Mon Apr 3 17:24:16 BST 2023 aarch64 GNU/Linux`.
`cat /etc/os-release`
`PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"``___`
```
sudo apt update
sudo apt install linux-image-rpi-v8 linux-headers-rpi-v8
```
The new kernel wasn't used after rebooting though, so I had to edit /boot/config.txt and add:
```
# New kernel (test)
kernel=vmlinuz-6.12.75+rpt-rpi-v8
initramfs initrd.img-6.12.75+rpt-rpi-v8 followkernel
```
I'll figure out how to make it so I don't have to manually keep config.txt updated but for now, I'm happy to have a process to stay up to date with current kernels.
/edit
Reading about the latest [Copy Fail security vulnerability](https://discourse.ifin.network/t/copy-fail-732-bytes-to-root-on-every-major-linux-distributions/342) I realised I was overdue a check on my system. It turns out I had even bigger problems - I was still on Debian 10/Buster.
To solve it I updated my apt list to contain:
deb http://archive.raspberrypi.org/debian/ bookworm main
But after doing this, updating and doing a full upgrade, my kernel is still 6.1.21.
I'm now reading that I should not have upgraded from bullseye to bookworm, so what is the easiest way forward from here? If there is a documented set of steps for this scenario I'd appreciate a link. I have a lot of services and scripts so reinstalling from scratch is not really an option.
`uname -a`
`Linux 6.1.21-v8+ #1642 SMP PREEMPT Mon Apr 3 17:24:16 BST 2023 aarch64 GNU/Linux`.
`cat /etc/os-release`
`PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"``___`