diff --git a/delayed-admin.sudoers b/delayed-admin.sudoers
index 3dea715..fe4ecac 100644
--- a/delayed-admin.sudoers
+++ b/delayed-admin.sudoers
@@ -1 +1 @@
-%delayed-admin ALL = /usr/local/bin/delayed
+%delayed-admin ALL = NOPASSWD: /usr/local/bin/delayed
diff --git a/lib/linux.sh b/lib/linux.sh
index 507a09e..5b512d8 100644
--- a/lib/linux.sh
+++ b/lib/linux.sh
@@ -8,16 +8,43 @@ function distro_id() {
   echo $ID
 }
 function admin_group() {
-  case $(distro_id) in
-    ubuntu|debian)
+  local id
+  id=$(distro_id)
+  case $id in
+    ubuntu|kubuntu|debian|linuxmint|pop|neon|elementary|zorin)
       echo "sudo"
       ;;
-    centos|fedora|rhel|arch|manjaro|endeavouros)
+    centos|fedora|rhel|arch|manjaro|endeavouros|opensuse*|sles)
       echo "wheel"
       ;;
+    *)
+      # Fallback: use ID_LIKE from /etc/os-release
+      local id_like
+      id_like=$(grep '^ID_LIKE=' /etc/os-release 2>/dev/null | cut -d= -f2- | tr -d '"')
+      case "$id_like" in
+        *ubuntu*|*debian*)
+          echo "sudo"
+          ;;
+        *rhel*|*fedora*|*centos*|*suse*)
+          echo "wheel"
+          ;;
+        *)
+          # Last resort: check which admin group actually exists on this system.
+          # If neither exists, admin_group() returns empty and the check below will abort.
+          if getent group sudo > /dev/null 2>&1; then
+            echo "sudo"
+          elif getent group wheel > /dev/null 2>&1; then
+            echo "wheel"
+          fi
+          ;;
+      esac
+      ;;
   esac
 }
 readonly ADMIN_GROUP=$(admin_group)
+if [ -z "$ADMIN_GROUP" ]; then
+  die "Could not determine the admin group for this OS (ID=$(distro_id)). Please file a bug report."
+fi
 #TODO Implement these
 function check_atd_is_running { true; }
 function start_atd { true; }