diff -Nru initramfs-tools-0.130ubuntu3/conf/initramfs.conf initramfs-tools-0.130ubuntu4/conf/initramfs.conf
--- initramfs-tools-0.130ubuntu3/conf/initramfs.conf	2018-01-05 13:44:09.000000000 +0100
+++ initramfs-tools-0.130ubuntu4/conf/initramfs.conf	2018-03-19 13:39:11.000000000 +0100
@@ -47,7 +47,7 @@
 COMPCACHE_SIZE=""
 
 #
-# COMPRESS: [ gzip | bzip2 | lzma | lzop | xz ]
+# COMPRESS: [ gzip | bzip2 | lz4 | lzma | lzop | xz ]
 #
 
 COMPRESS=gzip
diff -Nru initramfs-tools-0.130ubuntu3/debian/changelog initramfs-tools-0.130ubuntu4/debian/changelog
--- initramfs-tools-0.130ubuntu3/debian/changelog	2018-02-20 22:35:17.000000000 +0100
+++ initramfs-tools-0.130ubuntu4/debian/changelog	2018-04-11 23:37:21.000000000 +0200
@@ -1,3 +1,13 @@
+initramfs-tools (0.130ubuntu4) bionic; urgency=medium
+
+  [ Benjamin Tegge ]
+  * mkinitramfs: support lz4 as compress method (LP: #1488620)
+
+  [ Balint Reczey ]
+  * unmkinitramfs: support lz4 as compress method
+
+ -- Balint Reczey <rbalint@ubuntu.com>  Wed, 11 Apr 2018 23:37:21 +0200
+
 initramfs-tools (0.130ubuntu3) bionic; urgency=medium
 
   * Fix resuming a hibernate session from a swapfile (LP: #1644975)
diff -Nru initramfs-tools-0.130ubuntu3/debian/control initramfs-tools-0.130ubuntu4/debian/control
--- initramfs-tools-0.130ubuntu3/debian/control	2018-01-05 13:22:04.000000000 +0100
+++ initramfs-tools-0.130ubuntu4/debian/control	2018-04-11 23:35:36.000000000 +0200
@@ -28,7 +28,7 @@
 Architecture: all
 Multi-Arch: foreign
 Depends: ${busybox:Depends}, initramfs-tools-bin (= ${binary:Version}), klibc-utils (>= 2.0.4-8~), cpio, kmod | module-init-tools, udev, ${misc:Depends}
-Suggests: bash-completion
+Suggests: bash-completion, liblz4-tool
 Breaks: initramfs-tools (<< 0.121~), ${busybox:Breaks}
 Replaces: initramfs-tools (<< 0.121~)
 Description: generic modular initramfs generator (core tools)
diff -Nru initramfs-tools-0.130ubuntu3/mkinitramfs initramfs-tools-0.130ubuntu4/mkinitramfs
--- initramfs-tools-0.130ubuntu3/mkinitramfs	2018-01-05 13:27:32.000000000 +0100
+++ initramfs-tools-0.130ubuntu4/mkinitramfs	2018-03-19 13:39:19.000000000 +0100
@@ -151,6 +151,7 @@
 		echo "linux-2.6 likely misses ${COMPRESS} support, using gzip"
 fi
 
+[ "${compress}" = lz4 ] && compress="lz4 -9 -l"
 [ "${compress}" = lzop ] && compress="lzop -9"
 [ "${compress}" = xz ] && compress="xz --check=crc32"
 
diff -Nru initramfs-tools-0.130ubuntu3/unmkinitramfs initramfs-tools-0.130ubuntu4/unmkinitramfs
--- initramfs-tools-0.130ubuntu3/unmkinitramfs	2018-01-05 13:15:45.000000000 +0100
+++ initramfs-tools-0.130ubuntu4/unmkinitramfs	2018-03-19 13:39:19.000000000 +0100
@@ -18,6 +18,8 @@
 		zcat "$archive"
 	elif xzcat -t "$archive" >/dev/null 2>&1 ; then
 		xzcat "$archive"
+	elif lz4cat -t "$archive" >/dev/null 2>&1 ; then
+		lz4cat "$archive"
 	elif bzip2 -t "$archive" >/dev/null 2>&1 ; then
 		bzip2 -c -d "$archive"
 	elif lzop -t "$archive" >/dev/null 2>&1 ; then