Install matching Linux header files after Linux kernel upgrade

Question

I recently upgraded my Linux kernel from 4.19.20 to 5.5.0-0.bpo.2-amd64.

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

Reading package lists... Done Building dependency tree Reading state information... Done linux-headers-5.5.0-0.bpo.2-amd64 is already the newest version (5.5.17-1~bpo10+1). 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 

ls -l /usr/src/linux-headers-$(uname -r) gives me:

total 1432 drwxr-xr-x 3 root root 4096 6月 10 23:54 arch drwxr-xr-x 4 root root 4096 6月 10 23:54 include -rw-r--r-- 1 root root 61 4月 23 23:15 Makefile -rw-r--r-- 1 root root 1453072 4月 23 23:15 Module.symvers lrwxrwxrwx 1 root root 34 4月 23 23:15 scripts -> ../../lib/linux-kbuild-5.5/scripts lrwxrwxrwx 1 root root 32 4月 23 23:15 tools -> ../../lib/linux-kbuild-5.5/tools 

Does this mean that the matching Linux header files have been installed?

Answer 1

Yes, this means the headers have been installed.

See also the build and source symlinks in /lib/modules/$(uname -r) (those are the important locations).