diff --git a/ncdu-install.sh b/ncdu-install.sh
index 51b8c0d..b484a5d 100755
--- a/ncdu-install.sh
+++ b/ncdu-install.sh
@@ -1,11 +1,20 @@
 #!/bin/bash
+# vim: ts=4:sw=4:et
 
 if which ncdu &>/dev/null; then
-    echo 'ncdu is already installed'
+    zenity --info --title='Result' --no-wrap --text='ncdu is already installed'
     exit 0
 fi
 
+if ! tty -s; then
+    # script is running non-interactively, for ex by clicking "Execute" in dolphin
+    zenity --password --title="Enter password for `whoami`" --timeout=10 | sudo --stdin -- \
+    konsole -e "$0" "$@"
+    exit $?
+fi
+
 if [[ $UID -ne 0 ]]; then
+    echo "switching to root"
     sudo /bin/bash "$0" "$@"
     exit $?
 fi
@@ -20,3 +29,5 @@ pacman -S ncdu
 
 # SteamOS's wrapper for: btrfs property set -ts / ro true
 steamos-readonly enable
+
+zenity --info --title='Result' --no-wrap --text='Done'