diff -Nru dkms-2.3/debian/changelog dkms-2.3/debian/changelog
--- dkms-2.3/debian/changelog	2019-08-01 21:17:58.000000000 +0000
+++ dkms-2.3/debian/changelog	2019-10-14 09:50:50.000000000 +0000
@@ -1,3 +1,19 @@
+dkms (2.3-3ubuntu9.7) bionic; urgency=medium
+
+  * revert 0019-fix-OBSOLETE_BY-be-blocked-by-force-Closes-89.patch
+  * cherry-pick from upstream 9bbef17 for issue #89 #42
+    - 0019-add-force-version-override-and-dkms-_version-overrid.patch
+
+ -- Alex Tu <alex.tu@canonical.com>  Mon, 14 Oct 2019 17:50:50 +0800
+
+dkms (2.3-3ubuntu9.6) bionic; urgency=medium
+
+  * dkms: cherry-pick from upstream a35d981 for issue #89
+    0019-fix-OBSOLETE_BY-be-blocked-by-force-Closes-89.patch
+    (LP: #1838921)
+
+ -- Alex Tu <alex.tu@canonical.com>  Mon, 02 Sep 2019 16:15:04 +0800
+
 dkms (2.3-3ubuntu9.5) bionic; urgency=medium
 
   * Fixup previous upload: find_module doesn't exist yet, and there's bad
diff -Nru dkms-2.3/debian/patches/0019-add-force-version-override-and-dkms-_version-overrid.patch dkms-2.3/debian/patches/0019-add-force-version-override-and-dkms-_version-overrid.patch
--- dkms-2.3/debian/patches/0019-add-force-version-override-and-dkms-_version-overrid.patch	1970-01-01 00:00:00.000000000 +0000
+++ dkms-2.3/debian/patches/0019-add-force-version-override-and-dkms-_version-overrid.patch	2019-10-14 09:50:50.000000000 +0000
@@ -0,0 +1,83 @@
+From: Alex Tu <alex.tu@canonical.com>
+Date: Wed, 25 Sep 2019 16:00:23 +0800
+Subject: add --force-version-override and {dkms}_version-override option
+
+when --force-version-override or {dkms}_version-override content be
+found under /usr/share/dkms/modules_to_force_install/{file}, then it
+will skip the code block of version comparing with existed module.
+---
+ dkms | 26 ++++++++++++++++++++++----
+ 1 file changed, 22 insertions(+), 4 deletions(-)
+
+diff --git a/dkms b/dkms
+index 2293b49..e27acb7 100644
+--- a/dkms
++++ b/dkms
+@@ -135,7 +135,7 @@ show_usage()
+     echo $"  [action]  = { add | remove | build | install | uninstall | match | autoinstall"
+     echo $"               | mkdriverdisk | mktarball | ldtarball | mkrpm | mkkmp | mkdeb | mkbmdeb | status }"
+     echo $"  [options] = [-m module] [-v module-version] [-k kernel-version] [-a arch]"
+-    echo $"              [-d distro] [-c dkms.conf-location] [-q] [--force] [--all]"
++    echo $"              [-d distro] [-c dkms.conf-location] [-q] [--force] [--force-version-override] [--all]"
+     echo $"              [--templatekernel=kernel] [--directive='cli-directive=cli-value']"
+     echo $"              [--config=kernel-.config-location] [--archive=tarball-location]"
+     echo $"              [--kernelsourcedir=source-location] [--no-prepare-kernel] [--no-initrd]"
+@@ -784,6 +784,11 @@ check_version_sanity()
+     read -a kernels_module < <(find $lib_tree -name ${4}$module_suffix)
+     [ -z $kernels_module ] && return 0
+ 
++    if [[ "$force_version_override" == "true" ]]; then
++        # Skip the following version checking code.
++        return 0
++    fi
++
+     if [[ ${kernels_module[1]} ]]; then
+         warn $"Warning! Cannot do version sanity checking because multiple ${4}$module_suffix" \
+             $"modules were found in kernel $1."
+@@ -1394,6 +1399,10 @@ force_installation()
+ 
+         for elem in $to_force; do
+             if [ "${1}" = "${elem}" ]; then
++                echo "force"
++                return 0
++            elif [ "${1}_version-override" = "${elem}" ]; then
++                echo "version-override"
+                 return 0
+             fi
+         done
+@@ -1415,9 +1424,14 @@ install_module()
+     tmp_force="$force"
+ 
+     # If the module is set to be force-installed
+-    force_installation $module && echo "Forcing installation of $module" \
+-        && force="true"
+-
++    local ret=$(force_installation $module)
++    if [[ "$ret" == "force" ]];then
++        force="true"
++        echo "Forcing installation of $module"
++    elif [[ "$ret" == "version-override" ]];then
++        force_version_override="true"
++        echo "Forcing version override of $module"
++    fi
+     # Make sure that kernel exists to install into
+     [[ -e $install_tree/$kernelver ]] || die 6 \
+         $"The directory $install_tree/$kernelver doesn't exist." \
+@@ -3657,6 +3671,7 @@ kernel_source_dir=""
+ ksourcedir_fromcli=""
+ action=""
+ force=""
++force_version_override=""
+ no_prepare_kernel=""
+ no_clean_kernel=""
+ binaries_only=""
+@@ -3738,6 +3753,9 @@ while (($# > 0)); do
+         --force)
+             force="true"
+             ;;
++        --force-version-override)
++            force_version_override="true"
++            ;;
+         --all)
+             all="true"
+             ;;
diff -Nru dkms-2.3/debian/patches/series dkms-2.3/debian/patches/series
--- dkms-2.3/debian/patches/series	2019-07-03 17:44:04.000000000 +0000
+++ dkms-2.3/debian/patches/series	2019-10-14 09:50:50.000000000 +0000
@@ -16,3 +16,4 @@
 0016-make-sure-info-are-reset.patch
 0017-fix-OBSOLETE_BY-in-DKMS.CONF-Closes-81.patch
 lp-1827697.patch
+0019-add-force-version-override-and-dkms-_version-overrid.patch