Do not use lsb_release to determine the distribution, add a a static assignment

This patch should not be merged upstream
--- a/dkms
+++ b/dkms
@@ -363,10 +363,10 @@ function distro_version()
     if [ -r /etc/lsb-release ]; then
         . /etc/lsb-release
         LSB_RELEASE=1
-    elif type lsb_release >/dev/null 2>&1; then
-        DISTRIB_ID=$(lsb_release -i -s)
-        DISTRIB_RELEASE=$(lsb_release -r -s)
-        LSB_RELEASE=1
+    else
+	DISTRIB_ID=Debian
+	DISTRIB_RELEASE=$(cat /etc/debian_version)
+	LSB_RELEASE=1
     fi
 
     case "${DISTRIB_ID}" in