diff --git a/cosmic-greeter.toml b/cosmic-greeter.toml
index 333ec7f..f177a98 100644
--- a/cosmic-greeter.toml
+++ b/cosmic-greeter.toml
@@ -3,4 +3,4 @@ vt = "1"
 
 [default_session]
 command = "cage -s -- cosmic-greeter"
-user = "greeter"
+user = "cosmic-greeter"
diff --git a/debian/postinst b/debian/postinst
new file mode 100755
index 0000000..82f362e
--- /dev/null
+++ b/debian/postinst
@@ -0,0 +1,2 @@
+#!/bin/bash
+useradd --groups video --no-create-home --system cosmic-greeter
diff --git a/src/main.rs b/src/main.rs
index 5c8f026..aafc465 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -19,7 +19,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     match pwd::Passwd::current_user() {
         Some(current_user) => match current_user.name.as_str() {
-            "greeter" => greeter::main(),
+            "cosmic-greeter" => greeter::main(),
             _ => locker::main(current_user),
         },
         _ => Err("failed to determine current user".into()),