Starting from TLXOS 4.4.0, we compress kernel modules using either gzip or xz
so that they will fit in /boot (or /tfm in the case of RePC's alternative
32-bit kernel). This allows /boot to be upgraded independently of the base
layer of the root filesystem (/actualroot).
Jessie's version of kmod is too old to support compressed kernel modules.
Later versions were available from Sid, but until Buster the standard Debian
package didn't include the compressed module support options in the build.
Our build of kmod differs only in that we have added --with-zlib and --with-xz.