diff --git a/install.sh b/install.sh
index 62c5ce85..2d5960cf 100755
--- a/install.sh
+++ b/install.sh
@@ -200,7 +200,7 @@ else
 
   echo; prompt -w "${final_msg}"
 
-  if [[ -x /usr/bin/notify-send && "$UID" != '0' ]]; then
+  if has_command notify-send && [[ "$UID" != '0' ]]; then
     notify-send "'${name}' theme has been installed. Enjoy!" "${notif_msg}" -i "dialog-information-symbolic"
   fi
 fi
diff --git a/lib-install.sh b/lib-install.sh
index d91c6199..d70313a0 100755
--- a/lib-install.sh
+++ b/lib-install.sh
@@ -753,7 +753,10 @@ install_dash_to_dock() {
   fi
 
   udo cp -rf "${DASH_TO_DOCK_SRC_DIR}/dash-to-dock@micxgx.gmail.com"   "${GNOME_SHELL_EXTENSION_DIR}"
-  udo dbus-launch dconf write /org/gnome/shell/extensions/dash-to-dock/apply-custom-theme true
+
+  if has_command dbus-launch; then
+    udo dbus-launch dconf write /org/gnome/shell/extensions/dash-to-dock/apply-custom-theme true
+  fi
 }
 
 install_dash_to_dock_theme() {
@@ -776,7 +779,9 @@ install_dash_to_dock_theme() {
     fi
   fi
 
-  udo dbus-launch dconf write /org/gnome/shell/extensions/dash-to-dock/apply-custom-theme true
+  if has_command dbus-launch; then
+    udo dbus-launch dconf write /org/gnome/shell/extensions/dash-to-dock/apply-custom-theme true
+  fi
 }
 
 revert_dash_to_dock_theme() {
@@ -786,7 +791,9 @@ revert_dash_to_dock_theme() {
     restore_file "${DASH_TO_DOCK_DIR_ROOT}/stylesheet.css" "sudo"
   fi
 
-  udo dbus-launch dconf write /org/gnome/shell/extensions/dash-to-dock/apply-custom-theme false
+  if has_command dbus-launch; then
+    udo dbus-launch dconf write /org/gnome/shell/extensions/dash-to-dock/apply-custom-theme false
+  fi
 }
 
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