[Bug]: Ubuntu driver scripts assume standard kernel version naming, breaking custom kernels

[jfernandez]

Describe the bug

_resolve_kernel_version() in the Ubuntu nvidia-driver scripts assumes kernel versions follow Ubuntu's major.minor.patch-revision-flavor naming convention (e.g. 6.5.0-44-generic). Custom kernels built for Ubuntu that use non-standard version naming (e.g. 6.5.13custom-00004-g00fabdb6286a) are mangled into an incorrect version string, causing the driver build to fail because no matching linux-headers-* package exists.

The function extracts a version via regex from the Version: field and a flavor via sed 's/[^a-z]*//' from uname -r, then concatenates them. For non-standard kernels this produces a mangled, non-existent version. For example:

• uname -r: 6.5.13custom-00004-g00fabdb6286a
• Version regex extracts: 6.5.13-00004
• Flavor regex extracts: custom-00004-g00fabdb6286a
• Concatenated result: 6.5.13-00004-custom-00004-g00fabdb6286a (does not exist)
• Correct value: 6.5.13custom-00004-g00fabdb6286a (matches uname -r exactly)

To Reproduce

1. Run a kernel with a non-standard version string (e.g. a custom-built kernel using git-describe naming)
2. Ensure the corresponding linux-headers-$(uname -r) package is available in the apt repository
3. Run the gpu-driver-container. The driver build fails with "Could not resolve Linux kernel version"

Expected behavior

When linux-headers-${KERNEL_VERSION} already exists as a valid package for the exact uname -r output, the driver should use it as-is without attempting to decompose and reconstruct the version string.

Environment (please provide the following information):

• gpu-driver-container source: HEAD of main
• Host OS: Ubuntu 22.04
• Kernel Version: Any non-standard naming (e.g. 6.5.13custom-00004-g00fabdb6286a)
• CPU Architecture: x86_64

Information to attach

Affected files, all Ubuntu/Debian variants share the same _resolve_kernel_version() implementation:

• ubuntu16.04/nvidia-driver
• ubuntu18.04/nvidia-driver
• ubuntu20.04/nvidia-driver
• ubuntu22.04/nvidia-driver
• ubuntu24.04/nvidia-driver
• vgpu-manager/ubuntu20.04/nvidia-driver
• vgpu-manager/ubuntu22.04/nvidia-driver
• vgpu-manager/ubuntu24.04/nvidia-driver