Check Requirements for Debian

To check for kernel headers and install them if necessary on Debian systems, perform the following steps.

When they are properly installed, the required kernel headers are located under /usr/src/linux-headers-$(uname -r)/include/.

Prerequisites

Check BPF-based Sensor Requirements

Add IPtables as a prerequisite for using the Quarantine feature.

Procedure

To determine whether kernel headers are installed, run the following command:
```
$ sudo apt list --installed linux-headers-$(uname -r)
```
If the package is installed, the output will be similar to the following. An i or i+ in the left column signifies that the package is installed.

linux-headers-<version>-generic/…
To determine whether the kernel headers are available to install, run the following command:
```
$ sudo apt search linux-headers-$(uname -r)
```
If the package is available, the output will be similar to the following:

linux-headers-<version>-generic/…
To install any necessary available kernel headers, run the following command:
```
$ sudo apt install linux-headers-$(uname -r)
```
If the kernel header packages are not installed and are not available, update the kernel to a supported version and install the matching kernel headers.

Note: This action requires a reboot.
1. To list the available kernel and kernel header packages and find matching versions, run the following commands:
```
$ sudo apt search linux-image
$ sudo apt search linux-headers
```
  If newer packages are available, the output will be similar to the following:
  
  linux-image-<newer-version>-<arch>
  
  Linux <newer-version> for 64-bit PCs (signed)
  
  …
  
  linux-headers-<newer-version>-<arch>
  
  Header files for Linux <newer-version>-<arch>
  
  …
2. To install a newer supported kernel and kernel header packages with matching versions, run the following commands:
```
% sudo apt install kernel-default=<newer-version>
% kernel-default-devel=<newer-version>
```
3. Reboot into the new kernel.