diff -ur grub-2.04.orig/util/grub.d/10_linux.in grub-2.04/util/grub.d/10_linux.in
--- grub-2.04.orig/util/grub.d/10_linux.in	2019-08-18 15:50:55.155000000 +0200
+++ grub-2.04/util/grub.d/10_linux.in	2019-08-18 15:53:05.494000000 +0200
@@ -29,9 +29,9 @@
 CLASS="--class gnu-linux --class gnu --class os"
 
 if [ "x${GRUB_DISTRIBUTOR}" = "x" ] ; then
-  OS=GNU/Linux
+  OS="$(. /etc/os-release ; echo "$NAME $VERSION")"
 else
-  OS="${GRUB_DISTRIBUTOR} GNU/Linux"
+  OS="${GRUB_DISTRIBUTOR}"
   CLASS="--class $(echo ${GRUB_DISTRIBUTOR} | tr 'A-Z' 'a-z' | cut -d' ' -f1|LC_ALL=C sed 's,[^[:alnum:]_],_,g') ${CLASS}"
 fi
 
diff -ur grub-2.04.orig/util/grub.d/20_linux_xen.in grub-2.04/util/grub.d/20_linux_xen.in
--- grub-2.04.orig/util/grub.d/20_linux_xen.in	2019-08-18 15:50:55.155000000 +0200
+++ grub-2.04/util/grub.d/20_linux_xen.in	2019-08-18 15:53:05.494000000 +0200
@@ -29,9 +29,9 @@
 CLASS="--class gnu-linux --class gnu --class os --class xen"
 
 if [ "x${GRUB_DISTRIBUTOR}" = "x" ] ; then
-  OS=GNU/Linux
+  OS="$(. /etc/os-release ; echo "$NAME $VERSION")"
 else
-  OS="${GRUB_DISTRIBUTOR} GNU/Linux"
+  OS="${GRUB_DISTRIBUTOR}"
   CLASS="--class $(echo ${GRUB_DISTRIBUTOR} | tr 'A-Z' 'a-z' | cut -d' ' -f1|LC_ALL=C sed 's,[^[:alnum:]_],_,g') ${CLASS}"
 fi