diff --git a/configure_priv.sh b/configure_priv.sh
index 03ed126..9431ee3 100755
--- a/configure_priv.sh
+++ b/configure_priv.sh
@@ -24,6 +24,12 @@ configure_tuna() {
         if [[ $EUID -ne 0 ]]; then
             sudo python3 $scriptdir/files/oh-my-tuna.py
         fi
+        # 如果 /etc/apt/sources.list.d/ubuntu.sources 存在且文件内有 tuna，则跳过，否则直接覆盖
+        if [ -f /etc/apt/sources.list.d/ubuntu.sources ] && grep -q tuna /etc/apt/sources.list.d/ubuntu.sources; then
+            echo "检测到已切换到 Tuna 源，跳过覆盖。"
+        else
+            sudo cp $scriptdir/files/sources.list/ubuntu.sources /etc/apt/sources.list.d/ubuntu.sources
+        fi
     fi
 }
 
diff --git a/files/sources.list/ubuntu.sources b/files/sources.list/ubuntu.sources
new file mode 100644
index 0000000..66990fc
--- /dev/null
+++ b/files/sources.list/ubuntu.sources
@@ -0,0 +1,11 @@
+Types: deb
+URIs: https://mirrors.tuna.tsinghua.edu.cn/ubuntu/
+Suites: noble noble-updates noble-backports
+Components: main restricted universe multiverse
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg
+
+Types: deb
+URIs: https://mirrors.tuna.tsinghua.edu.cn/ubuntu/
+Suites: noble-security
+Components: main restricted universe multiverse
+Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg