diff --git a/scripts/webui/webui_install_systemd.sh b/scripts/webui/webui_install_systemd.sh
index d049a78..eebe079 100755
--- a/scripts/webui/webui_install_systemd.sh
+++ b/scripts/webui/webui_install_systemd.sh
@@ -24,12 +24,17 @@ installLibrePortalWebUITaskService()
   # back to /var/run/docker.sock (which rootless does not create) and any
   # `docker …` call inside the task would fail. Rootful gets no extras —
   # the default /var/run path is already correct.
+  #
+  # The rootless daemon runs as the DOCKER INSTALL USER, so its socket lives in
+  # that user's runtime dir — not the manager's. Use the docker install user's
+  # uid here (matches dockerCommandRunInstallUser); pointing at the manager's
+  # uid was wrong — that socket doesn't exist.
   local service_env_block=""
   if [[ "$CFG_DOCKER_INSTALL_TYPE" == "rootless" ]]; then
-    local libreportal_uid
-    libreportal_uid="$(id -u "$sudo_user_name")"
-    service_env_block="Environment=DOCKER_HOST=unix:///run/user/${libreportal_uid}/docker.sock
-Environment=XDG_RUNTIME_DIR=/run/user/${libreportal_uid}"
+    local docker_install_uid
+    docker_install_uid="$(id -u "$CFG_DOCKER_INSTALL_USER")"
+    service_env_block="Environment=DOCKER_HOST=unix:///run/user/${docker_install_uid}/docker.sock
+Environment=XDG_RUNTIME_DIR=/run/user/${docker_install_uid}"
   fi
 
   # Create systemd service file