diff --git a/README.md b/README.md
index 8e55be8..4ccf79a 100644
--- a/README.md
+++ b/README.md
@@ -347,8 +347,9 @@ cd pc && rm -rf node_modules && yarn install
 |------|------|
 | **完整校验** | 安装 **mongosh** 可测认证与库访问；安装 **AWS CLI**（命令 `aws`）可列桶与读写探测。 |
 | **未安装工具时** | MongoDB 可用 **nc** 仅测端口连通；S3 会跳过并打印手动验证命令。 |
-| **安装提示** | 脚本按系统给出命令（macOS 为 `brew`；Debian/Ubuntu 为 `apt-get`；Amazon/RHEL 为 `dnf`/`yum`），不会在 Linux 上误导为 `brew`。 |
-| **可选自动安装** | 以 **root** 执行且 `CHECK_CONN_AUTO_INSTALL=1` 时，会尝试用 `apt`/`dnf`/`yum` 安装缺失的 `awscli`、`mongodb-mongosh`；失败仅告警，可按屏幕提示手动安装。 |
+| **安装提示** | 脚本按系统给出命令（macOS 为 `brew`；Amazon/RHEL 为 `dnf`/`yum`），不会在 Linux 上误导为 `brew`。 |
+| **Ubuntu/Debian 与 mongosh** | 默认 apt **没有** `mongodb-mongosh` 包（`Unable to locate package` 属正常）。需 [MongoDB 官方文档](https://www.mongodb.com/docs/mongodb-shell/install/) 添加 apt 源后再安装，或使用 `snap install mongosh`。 |
+| **可选自动安装** | **root** 且 `CHECK_CONN_AUTO_INSTALL=1`：**mongosh** 依次默认 apt、snap、MongoDB 8.0 源。**aws** 先 `apt install awscli` / `dnf`/`yum` 装 `aws-cli`；若无包或失败再下载 **AWS CLI v2 官方 zip** 安装（需 `curl`/`unzip` 与联网）。 |
 | **默认值** | `01-init-env.sh` 生成的 `.env.deploy-test` 已写入 `CHECK_CONN_AUTO_INSTALL=1`；`check-conn.sh` 通过 `load_env` 读取。关闭则改为 `0` 或删行。 |
 
 ```bash
diff --git a/check-conn.sh b/check-conn.sh
index b00c2d1..25477cf 100755
--- a/check-conn.sh
+++ b/check-conn.sh
@@ -22,19 +22,43 @@ _hint_install_mongosh() {
   if [[ "$(uname -s)" == "Darwin" ]]; then
     echo "brew install mongosh"
   elif command -v apt-get &>/dev/null; then
-    echo "sudo apt-get update && sudo apt-get install -y mongodb-mongosh"
+    echo "Debian/Ubuntu 默认源通常无 mongodb-mongosh：添加 MongoDB 官方 apt 源后安装，或 snap install mongosh。文档: https://www.mongodb.com/docs/mongodb-shell/install/"
   elif command -v dnf &>/dev/null; then
-    echo "sudo dnf install -y mongodb-mongosh"
+    echo "sudo dnf install -y mongodb-mongosh  （若无包见官方文档）"
   else
     echo "https://www.mongodb.com/docs/mongodb-shell/install/"
   fi
 }
 
+# root + apt：添加 MongoDB 8.0 官方源后安装 mongodb-mongosh（Ubuntu/Debian）
+_try_add_mongodb_apt_repo_and_install_mongosh() {
+  [[ -f /etc/os-release ]] || return 1
+  # shellcheck source=/dev/null
+  source /etc/os-release
+  local codename="${VERSION_CODENAME:-}"
+  [[ -n "$codename" ]] || return 1
+  local gpg=/usr/share/keyrings/mongodb-server-8.0.gpg
+  local list=/etc/apt/sources.list.d/mongodb-org-8.0.list
+  local deb_line=""
+  case "${ID:-}" in
+    ubuntu) deb_line="deb [ signed-by=${gpg} ] https://repo.mongodb.org/apt/ubuntu ${codename}/mongodb-org/8.0 multiverse" ;;
+    debian) deb_line="deb [ signed-by=${gpg} ] https://repo.mongodb.org/apt/debian ${codename}/mongodb-org/8.0 main" ;;
+    *)      return 1 ;;
+  esac
+
+  DEBIAN_FRONTEND=noninteractive apt-get install -y -qq curl ca-certificates gnupg >/dev/null 2>&1 || true
+  curl -fsSL https://www.mongodb.org/static/pgp/server-8.0.asc | gpg -o "$gpg" --dearmor 2>/dev/null || return 1
+  echo "$deb_line" > "$list"
+  DEBIAN_FRONTEND=noninteractive apt-get update -qq || return 1
+  DEBIAN_FRONTEND=noninteractive apt-get install -y mongodb-mongosh || return 1
+  return 0
+}
+
 _hint_install_awscli() {
   if [[ "$(uname -s)" == "Darwin" ]]; then
     echo "brew install awscli"
   elif command -v apt-get &>/dev/null; then
-    echo "sudo apt-get update && sudo apt-get install -y awscli"
+    echo "若 apt 无 awscli 包：使用 AWS CLI v2 官方 bundle（需 curl+unzip）见 https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html"
   elif command -v dnf &>/dev/null; then
     echo "sudo dnf install -y aws-cli"
   elif command -v yum &>/dev/null; then
@@ -44,6 +68,37 @@ _hint_install_awscli() {
   fi
 }
 
+# root：从 AWS 官方 zip 安装 CLI v2（适用于 apt 无 awscli 包的 Ubuntu/Debian 等）
+_try_install_awscli_via_v2_bundle() {
+  local arch zipname
+  arch=$(uname -m)
+  case "$arch" in
+    x86_64) zipname=awscli-exe-linux-x86_64.zip ;;
+    aarch64) zipname=awscli-exe-linux-aarch64.zip ;;
+    *) return 1 ;;
+  esac
+  local tmp
+  tmp=$(mktemp -d)
+  if command -v apt-get &>/dev/null; then
+    DEBIAN_FRONTEND=noninteractive apt-get install -y -qq curl unzip ca-certificates >/dev/null 2>&1 || true
+  fi
+  if ! curl -fsSL "https://awscli.amazonaws.com/${zipname}" -o "${tmp}/awscliv2.zip"; then
+    rm -rf "$tmp"
+    return 1
+  fi
+  if ! unzip -q "${tmp}/awscliv2.zip" -d "$tmp"; then
+    rm -rf "$tmp"
+    return 1
+  fi
+  if ! "${tmp}/aws/install"; then
+    rm -rf "$tmp"
+    return 1
+  fi
+  rm -rf "$tmp"
+  hash -r 2>/dev/null || true
+  command -v aws &>/dev/null
+}
+
 # root + CHECK_CONN_AUTO_INSTALL=1 时尝试安装（失败则仅告警，不退出）
 _try_install_mongosh() {
   [[ "${CHECK_CONN_AUTO_INSTALL:-0}" == "1" ]] || return 0
@@ -58,6 +113,13 @@ _try_install_mongosh() {
       && DEBIAN_FRONTEND=noninteractive apt-get install -y mongodb-mongosh; then
       command -v mongosh &>/dev/null && success "mongosh 已可用" && return 0
     fi
+    if command -v snap &>/dev/null && snap install mongosh; then
+      command -v mongosh &>/dev/null && success "mongosh 已可用 (snap)" && return 0
+    fi
+    info "尝试通过 MongoDB 官方 apt 源安装 mongodb-mongosh ..."
+    if _try_add_mongodb_apt_repo_and_install_mongosh; then
+      command -v mongosh &>/dev/null && success "mongosh 已可用 (MongoDB 官方源)" && return 0
+    fi
   elif command -v dnf &>/dev/null; then
     if dnf install -y mongodb-mongosh; then
       command -v mongosh &>/dev/null && success "mongosh 已可用" && return 0
@@ -76,18 +138,20 @@ _try_install_awscli() {
   }
   info "CHECK_CONN_AUTO_INSTALL：尝试安装 awscli ..."
   if command -v apt-get &>/dev/null; then
-    if DEBIAN_FRONTEND=noninteractive apt-get update -qq \
-      && DEBIAN_FRONTEND=noninteractive apt-get install -y awscli; then
-      command -v aws &>/dev/null && success "awscli 已可用" && return 0
-    fi
+    DEBIAN_FRONTEND=noninteractive apt-get update -qq \
+      && DEBIAN_FRONTEND=noninteractive apt-get install -y awscli || true
   elif command -v dnf &>/dev/null; then
-    if dnf install -y aws-cli; then
-      command -v aws &>/dev/null && success "awscli 已可用" && return 0
-    fi
+    dnf install -y aws-cli || true
   elif command -v yum &>/dev/null; then
-    if yum install -y aws-cli; then
-      command -v aws &>/dev/null && success "awscli 已可用" && return 0
-    fi
+    yum install -y aws-cli || true
+  fi
+  if command -v aws &>/dev/null; then
+    success "awscli 已可用 (系统包管理器)"
+    return 0
+  fi
+  info "系统源无 aws/awscli 或安装失败，尝试 AWS CLI v2 官方安装包（需联网）..."
+  if _try_install_awscli_via_v2_bundle; then
+    command -v aws &>/dev/null && success "awscli 已可用 (AWS 官方 bundle)" && return 0
   fi
   warn "awscli 自动安装未成功，请手动: $(_hint_install_awscli)"
   return 0