diff --git a/builder.go b/builder.go
index 8c3fb87..b452d4e 100644
--- a/builder.go
+++ b/builder.go
@@ -280,6 +280,16 @@ func (b *builder) makeImg(ctx context.Context) error {
 }
 
 func (b *builder) mountImg(ctx context.Context) error {
+	var mkfsExt4Opts []string
+	r := ctx.Value("release").(OSRelease)
+	if r.ID == ReleaseUbuntu {
+		if strings.HasPrefix(r.VersionID, "12.") {
+			mkfsExt4Opts = append(mkfsExt4Opts, "-O", "^has_journal,^metadata_csum")
+		}
+		if strings.HasPrefix(r.VersionID, "14.") {
+			mkfsExt4Opts = append(mkfsExt4Opts, "-O", "^metadata_csum")
+		}
+	}
 	logrus.Infof("mounting raw image")
 	o, _, err := exec.RunOut(ctx, "losetup", "--show", "-f", b.diskRaw)
 	if err != nil {
@@ -315,7 +325,7 @@ func (b *builder) mountImg(ctx context.Context) error {
 		b.rootPart = "/dev/mapper/root"
 		b.mappedCryptRoot = filepath.Join("/dev/mapper", b.cryptRoot)
 		logrus.Infof("creating raw image file system")
-		if err := exec.Run(ctx, "mkfs.ext4", b.mappedCryptRoot); err != nil {
+		if err := exec.Run(ctx, "mkfs.ext4", append(mkfsExt4Opts, b.mappedCryptRoot)...); err != nil {
 			return err
 		}
 		if err := exec.Run(ctx, "mount", b.mappedCryptRoot, b.mntPoint); err != nil {
@@ -323,7 +333,7 @@ func (b *builder) mountImg(ctx context.Context) error {
 		}
 	} else {
 		logrus.Infof("creating raw image file system")
-		if err := exec.Run(ctx, "mkfs.ext4", b.rootPart); err != nil {
+		if err := exec.Run(ctx, "mkfs.ext4", append(mkfsExt4Opts, b.rootPart)...); err != nil {
 			return err
 		}
 		if err := exec.Run(ctx, "mount", b.rootPart, b.mntPoint); err != nil {
@@ -339,7 +349,7 @@ func (b *builder) mountImg(ctx context.Context) error {
 	if b.bootFS.IsFat() {
 		err = exec.Run(ctx, "mkfs.fat", "-F32", b.bootPart)
 	} else {
-		err = exec.Run(ctx, "mkfs.ext4", b.bootPart)
+		err = exec.Run(ctx, "mkfs.ext4", append(mkfsExt4Opts, b.bootPart)...)
 	}
 	if err != nil {
 		return err
diff --git a/convert.go b/convert.go
index 769de35..7de1ae4 100644
--- a/convert.go
+++ b/convert.go
@@ -45,7 +45,7 @@ func Convert(ctx context.Context, img string, opts ...ConvertOption) error {
 	if err != nil {
 		return err
 	}
-
+	ctx = context.WithValue(ctx, "release", r)
 	if o.luksPassword != "" && !r.SupportsLUKS() {
 		return fmt.Errorf("luks is not supported for %s %s", r.Name, r.Version)
 	}
diff --git a/templates/ubuntu.Dockerfile b/templates/ubuntu.Dockerfile
index 1589379..553aacf 100644
--- a/templates/ubuntu.Dockerfile
+++ b/templates/ubuntu.Dockerfile
@@ -2,13 +2,18 @@ FROM {{ .Image }}
 
 USER root
 
+{{ if le .Release.VersionID "14.04" }}
+# restore initctl
+RUN rm /sbin/initctl && dpkg-divert --rename --remove /sbin/initctl
+# setup ttyS0
+RUN cp /etc/init/tty1.conf /etc/init/ttyS0.conf && sed -i s/tty1/ttyS0/g /etc/init/ttyS0.conf
+{{ end }}
+
 RUN ARCH="$([ "$(uname -m)" = "x86_64" ] && echo amd64 || echo arm64)"; \
   apt-get update && \
   DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \
   linux-image-virtual \
   initramfs-tools \
-  systemd-sysv \
-  systemd \
 {{- if .Grub }}
   grub-common \
   grub2-common \
@@ -21,10 +26,24 @@ RUN ARCH="$([ "$(uname -m)" = "x86_64" ] && echo amd64 || echo arm64)"; \
 {{- end }}
   dbus \
   isc-dhcp-client \
-  iproute2 \
   iputils-ping && \
   find /boot -type l -exec rm {} \;
 
+{{ if ge .Release.VersionID "14.04" }}
+RUN ARCH="$([ "$(uname -m)" = "x86_64" ] && echo amd64 || echo arm64)"; \
+  apt-get update && \
+  DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \
+  iproute2
+{{ end }}
+
+{{ if ge .Release.VersionID "16.04" }}
+RUN ARCH="$([ "$(uname -m)" = "x86_64" ] && echo amd64 || echo arm64)"; \
+  apt-get update && \
+  DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \
+  systemd-sysv \
+  systemd
+{{ end }}
+
 {{ if gt .Release.VersionID "16.04" }}
 RUN systemctl preset-all
 {{ end }}
@@ -32,7 +51,7 @@ RUN systemctl preset-all
 {{ if .Password }}RUN echo "root:{{ .Password }}" | chpasswd {{ end }}
 
 {{ if eq .NetworkManager "netplan" }}
-RUN apt install -y netplan.io
+RUN apt-get install -y netplan.io
 RUN mkdir -p /etc/netplan && printf '\
 network:\n\
   version: 2\n\
@@ -47,7 +66,7 @@ network:\n\
         - 8.8.4.4\n\
 ' > /etc/netplan/00-netcfg.yaml
 {{ else if eq .NetworkManager "ifupdown"}}
-RUN if [ -z "$(apt-cache madison ifupdown-ng 2> /dev/nul)" ]; then apt install -y ifupdown; else apt install -y ifupdown-ng; fi
+RUN if [ -z "$(apt-cache madison ifupdown-ng 2> /dev/nul)" ]; then apt-get install -y ifupdown; else apt-get install -y ifupdown-ng; fi
 RUN mkdir -p /etc/network && printf '\
 auto eth0\n\
 allow-hotplug eth0\n\