I need to compile a driver on the raspberry my kernel is
6.6.78-current-bcm2711 I need to download linux-headers-6.6.78 can someone help

apt-cache search linux-headers

 

If not there, use the build framework to create your own set of kernel packages including headers: https://docs.armbian.com/Developer-Guide_Build-Preparation/

5 hours ago, Guilherme said:

6.6.78-current-bcm2711 I need to download linux-headers-6.6.78 can someone help

 

https://netcup-03.armbian.com/apt/pool/main/l/linux-headers-legacy-bcm2711/

 

Try with:

 

sudo apt install linux-headers-legacy-bcm2711

 

I've tried this one and it didn't work because it returns saying that it's legacy and it didn't work see

/home/custela/uv4l2# insmod uv4l2.ko
insmod: ERROR: could not insert module uv4l2.ko: Invalid module format
/home/custela/uv4l2# dmesg
[ 782.935603] uv4l2: disagrees about version of symbol module_layout
/home/custela/uv4l2# modinfo uv4l2.ko
filename: /home/custela/uv4l2/uv4l2.ko
author: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
license: GPL
srcversion: 8A60DC9287145B2DA7A51CE
depends: videobuf2-v4l2,videodev,videobuf2-common,videobuf2-vmalloc
name: uv4l2
vermagic: 6.6.78-legacy-bcm2711 SMP preempt mod_unload modversions aarch64
/home/custela/uv4l2# uname -r
6.6.78-current-bcm2711
/home/custela/uv4l2#

Ah. I guess at time of installation 6.6.y was current but since 6.12 is now available as new lts it has been  moved to legacy. Therefore the name is different.

Simplest to get matching packages is IMHO using the framework to create a set of packages and install them via dpkg.

Yes, you need to install matching kernel and headers, otherwise it won't work. Remove CURRENT kernels by hand, install LEGACY and then proceed with headers installation. This will work.