diff --git a/usr/bin/installer-dist b/usr/bin/installer-dist
index c588cf9..16baa33 100755
--- a/usr/bin/installer-dist
+++ b/usr/bin/installer-dist
@@ -1350,10 +1350,11 @@ install_package_debian_common(){
 add_user_to_vbox_group(){
   id_of_user="$(id --name --user)" || die 1 "${underline}Linux user ID check:${nounderline} Failed to run: 'id --name --user'"
   if id -nG "$id_of_user" | grep -qw "${virtualbox_linux_user_group}\$"; then
-    log info "Linux account '$id_of_user' is already a member of the Linux group 'vboxusers'."
+    log info "Linux account '${id_of_user}' is already a member of the Linux group 'vboxusers'."
     return 0
   fi
-  root_cmd adduser "$id_of_user" "${virtualbox_linux_user_group}" || die 1 "${underline}adduser to Linux user group virtualbox:${nounderline} Failed to add user '$id_of_user' to group '${virtualbox_linux_user_group}'."
+
+    root_cmd usermoad --append --groups "${id_of_user}" "${virtualbox_linux_user_group}" || die 1 "${underline}adduser to Linux user group virtualbox:${nounderline} Failed to add user '$id_of_user' to group '${virtualbox_linux_user_group}'."
 }