--- VirtualBox-5.1.2/src/VBox/Installer/linux/VBox.sh.orig	2016-07-29 18:45:38.074668094 +0200
+++ VirtualBox-5.1.2/src/VBox/Installer/linux/VBox.sh	2016-07-29 19:23:07.702016897 +0200
@@ -40,6 +40,23 @@
 #         test -n "${path}" || pwd
 #     done
 # )
+ 
+show_message() {
+	local BINFILE=${0##*/} message
+
+	if [ "$DESKTOP" = "kde" ]; then
+		message=$(cat)
+		PATH=$(kde4-config --path exe) kdialog --sorry "$message"
+	elif [ -n "$DISPLAY" ] && [ -x /usr/bin/gxmessage ]; then
+		gxmessage --center --buttons GTK_STOCK_OK -wrap -geometry 400x150 -name $BINFILE -file -
+	elif [ -n "$DISPLAY" ] && [ -x /usr/bin/zenity ]; then
+		message=$(cat)
+		zenity --error --icon-name=virtualbox --text "$message"
+	else
+		cat >&2
+	fi
+}
+
 
 if test -f /usr/lib/virtualbox/VirtualBox &&
     test -x /usr/lib/virtualbox/VirtualBox; then
@@ -47,7 +64,7 @@
 elif test -f "${MY_DIR}/VirtualBox" && test -x "${MY_DIR}/VirtualBox"; then
     INSTALL_DIR="${MY_DIR}"
 else
-    echo "Could not find VirtualBox installation. Please reinstall."
+    echo "Could not find VirtualBox installation. Please reinstall." | show_message
     exit 1
 fi
 
@@ -57,7 +74,7 @@
 if [ "$1" = "shutdown" ]; then
     SHUTDOWN="true"
 elif ! lsmod|grep -q vboxdrv; then
-    cat << EOF
+    show_message << EOF
 WARNING: The vboxdrv kernel module is not loaded. Either there is no module
          available for the current kernel (`uname -r`) or it failed to
          load. Please recompile the kernel module and install it by
@@ -67,7 +84,7 @@
          You will not be able to start VMs until this problem is fixed.
 EOF
 elif [ ! -c /dev/vboxdrv ]; then
-    cat << EOF
+    show_message << EOF
 WARNING: The character device /dev/vboxdrv does not exist. Try
 
            sudo /sbin/vboxconfig
@@ -79,7 +96,7 @@
 fi
 
 if [ -f /etc/vbox/module_not_compiled ]; then
-    cat << EOF
+    show_message << EOF
 WARNING: The compilation of the vboxdrv.ko kernel module failed during the
          installation for some reason. Starting a VM will not be possible.
          Please consult the User Manual for build instructions.