diff --git a/deploy/setup-certs.sh b/deploy/setup-certs.sh
index f945842..82eea67 100755
--- a/deploy/setup-certs.sh
+++ b/deploy/setup-certs.sh
@@ -16,7 +16,8 @@ mkdir -p "$CERT_DIR"
 # 1) 确认 mkcert 已安装
 if ! command -v mkcert >/dev/null 2>&1; then
   echo "✗ 未找到 mkcert。先安装:"
-  echo "    brew install mkcert nss     # nss 是给 Firefox 用的"
+  echo "    macOS:  brew install mkcert nss     # nss 是给 Firefox 用的"
+  echo "    Ubuntu: sudo apt update && sudo apt install -y mkcert libnss3-tools"
   exit 1
 fi