diff --git a/hardware/ovh/grub.sh b/hardware/ovh/grub.sh
index 6eba726..f0560ad 100755
--- a/hardware/ovh/grub.sh
+++ b/hardware/ovh/grub.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
 set -e
 
-
-echo 'grub-pc/install_devices multiselect /dev/sda, /dev/sdb' | debconf-set-selections
+grub-install /dev/sda
+grub-install /dev/sdb
diff --git a/post-debootstrap-installer.sh b/post-debootstrap-installer.sh
index 7de86fe..20a8cbf 100755
--- a/post-debootstrap-installer.sh
+++ b/post-debootstrap-installer.sh
@@ -13,24 +13,22 @@ echo 'locales locales/locales_to_be_generated multiselect en_US.UTF-8 UTF-8' | d
 apt-get -y install locales
 
 
-# mdadm
+### boot
 
-apt-get -y install mdadm
+apt-get -y install mdadm cryptsetup btrfs-tools
+# after cryptsetup, mdadm, ... because of update-initramfs
+apt-get -y install linux-image-amd64
 
-#replace rescue system hostname with real hostname
+# replace rescue system hostname with real hostname
 mdadm --examine --scan | perl -pe 's/name\=.*?:/name='"$(cat /etc/hostname)"':/' > /etc/mdadm/mdadm.conf
 
-
-# boot
-
+DEBIAN_FRONTEND=noninteractive apt-get -y install grub-pc
 /grub.sh
-apt-get -y install linux-image-amd64
-apt-get -y install grub-pc
 
 
-# Docker
+### Docker
 
-#add docker key
+# add docker key
 apt-get -y install gnupg2
 apt-key add docker.key
 apt-get -y --purge autoremove gnupg2
@@ -41,10 +39,9 @@ apt-get update
 apt-get -y install docker-ce
 
 
-# tbd
+### tbd
 
 apt-get -y install \
     systemd \
     dropbear \
-    btrfs-utils \
-    cryptsetup
+    man-db