Kernel headers for 6.14.3-061403-generic not found

I have a package for a driver that I'm trying to build and deploy on 6.14.3. However the build breaks with the error: Building for 6.14.3-061403-generic Building for architecture amd64 Module build for kernel 6.14.3-061403-generic was skipped since the kernel headers for this kernel does not seem to be installed. I cannot find the specified headers in any apt repository so far: $ apt list linux-headers-6.14.3-061404-generic Listing... Done Can anybody advise me where I can find these headers? Update: I've done: sudo apt install linux-headers-$(uname -r) which results in: Reading package lists... Done Building dependency tree... Done Reading state information... Done Package linux-headers-6.14.3-061403-generic is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'linux-headers-6.14.3-061403-generic' has no installation candidate How do I fix this? Is there a repository I'm missing? I can see it here https://kernel.ubuntu.com/mainline/v6.14.3/amd64/linux-headers-6.14.3-061403_6.14.3-061403.202504200838_all.deb so why can't apt install retrieve it too?