I was trying to install rtl8821au downloaded from the link


driver module in the Debian 11 rootfs.

I'm using kernel - 4.14.0-xilinx

while following the steps i used the command

sudo apt install linux-headers-$(uname -r)

Then I got the following error

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package linux-headers-4.14.0-xilinx
E: Couldn't find any package by glob 'linux-headers-4.14.0-xilinx'

How to solve this issue? Any help will be really appreciated!!

1 Answer 1


The package name is just: linux-headers.

For a particular version you can follow the package name with: = and then the version numbers.

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