diff --git a/.gitea/workflows/deploy.yml b/.gitea/workflows/deploy.yml
index 9f6e811..f16aa3c 100644
--- a/.gitea/workflows/deploy.yml
+++ b/.gitea/workflows/deploy.yml
@@ -10,18 +10,34 @@ jobs:
     steps:
       - name: 安装 Docker CLI
         run: |
-          # 大概率 gitea act_runner 已预装 docker，先探测（避免 apt 走国外源超时）
           if command -v docker >/dev/null 2>&1; then
             echo "Docker 已预装：$(docker --version)"
             exit 0
           fi
-          echo "Docker 未预装，换 Ubuntu 源到阿里云再 apt 安装"
-          # 兼容 legacy sources.list、deb822 .sources、以及 sources.list.d/*.list
+          echo "=== 1. 系统信息 ==="
+          cat /etc/os-release | head -5 || true
+          echo ""
+          echo "=== 2. 换源前 sources 文件 ==="
+          ls -la /etc/apt/sources.list /etc/apt/sources.list.d/ 2>&1 || true
+          grep -h -E 'ubuntu|debian|http' /etc/apt/sources.list /etc/apt/sources.list.d/*.sources /etc/apt/sources.list.d/*.list 2>/dev/null | grep -v '^#' | head -10 || true
+          echo ""
+          echo "=== 3. 换源到阿里云 ==="
           sed -i 's|archive.ubuntu.com|mirrors.aliyun.com|g;s|security.ubuntu.com|mirrors.aliyun.com|g' /etc/apt/sources.list 2>/dev/null || true
           sed -i 's|archive.ubuntu.com|mirrors.aliyun.com|g;s|security.ubuntu.com|mirrors.aliyun.com|g' /etc/apt/sources.list.d/*.sources 2>/dev/null || true
           sed -i 's|archive.ubuntu.com|mirrors.aliyun.com|g;s|security.ubuntu.com|mirrors.aliyun.com|g' /etc/apt/sources.list.d/*.list 2>/dev/null || true
-          timeout 90 apt-get update -qq || { echo "apt-get update 超时/失败"; exit 1; }
-          timeout 240 apt-get install -y -qq docker.io || { echo "docker.io 安装超时/失败"; exit 1; }
+          echo "--- 换源后 sources 内容："
+          grep -h -E 'aliyun|ubuntu|debian|http' /etc/apt/sources.list /etc/apt/sources.list.d/*.sources /etc/apt/sources.list.d/*.list 2>/dev/null | grep -v '^#' | head -10 || true
+          echo ""
+          echo "=== 4. 网络探测 ==="
+          echo "--- DNS 解析 mirrors.aliyun.com："
+          timeout 5 getent hosts mirrors.aliyun.com || echo "DNS 解析失败"
+          echo "--- HTTP 探测 mirrors.aliyun.com："
+          timeout 10 curl -s -o /dev/null -w "http_code=%{http_code} time=%{time_total}s\n" http://mirrors.aliyun.com/ || echo "curl 阿里云失败"
+          echo ""
+          echo "=== 5. apt-get update ==="
+          timeout 90 apt-get update || { echo "apt-get update 失败，看上面日志定位"; exit 1; }
+          echo "=== 6. 安装 docker.io ==="
+          timeout 240 apt-get install -y docker.io || { echo "docker.io 安装超时"; exit 1; }
           docker --version
 
       - name: 拉取代码