Trouble installing headers - manjaro arm kde plasma 20.12

[Tomek]

Kernel 5.9 is EOL and is no longer supported in Manjaro ARM, so there are no headers for this kernel. Also you don’t have choice because Manjaro ARM doesn’t support multiple kernels. So you should fully update your system and use 5.11 kernel and headers.

Mhwd-kernel on ARM

We don’t have/use MHWD on ARM. The reason is simple. We don’t support having multiple kernels installed. And on ARM we don’t have the privilige of having multiple GPU driver options, so MHWD wouldn’t help there either. So we opted to keep it simple, and just use the repo pakages instead of some tool to only detect between 1 option.