diff --git a/README.en.md b/README.en.md
index 3fc4a81..e08b965 100644
--- a/README.en.md
+++ b/README.en.md
@@ -149,10 +149,35 @@ bash reinstall.sh centos      9
 > When installing other systems, can monitor the progress through various methods (SSH, HTTP 80 port, VNC in the background, serial console).
 > Even if errors occur during the installation process, you can still install Alpine via SSH.
 
+<details>
+
+<summary>Experimental Features</summary>
+
+Install Debian using a cloud image, suitable for machines with slower CPUs
+
+```bash
+bash reinstall.sh debian --ci
+```
+
+Install CentOS, Alma, Rocky, Fedora using ISO, only supports machines with more than 2G of memory and dynamic IP
+
+```bash
+bash reinstall.sh centos --installer
+```
+
+Install Ubuntu using ISO, only supports machines with more than 1G of memory and dynamic IP
+
+```bash
+bash reinstall.sh ubuntu --installer
+```
+
+</details>
+
 ### Feature 2: DD
 
-- Supports `raw`, `vhd`, `gzip` and `xz` formatted images
-- When using DD with a Windows image, the script will automatically expand the system partition. For static IP machines, the IP will be configured automatically, and it may take a few minutes to take effect on first boot
+- Supports `raw`, `vhd` images or those compressed with `xz` or `gzip`.
+- When deploy a Windows image, the system disk will be expanded, and machines with static IPs will have their IPs configured. However, it may take a few minutes after the first boot for the configuration to take effect.
+- When deploy a Linux image, the system disk **will not** be expanded, and machines with static IPs **will not** have their IPs configured.
 
 ```bash
 bash reinstall.sh dd --img https://example.com/xxx.xz
diff --git a/README.md b/README.md
index d389807..4c640fc 100644
--- a/README.md
+++ b/README.md
@@ -149,10 +149,35 @@ bash reinstall.sh centos      9
 > 安装其它系统时，可通过多种方式（SSH、HTTP 80 端口、后台 VNC、串行控制台）查看安装进度。
 > 即使安装过程出错，也能通过 SSH 安装到 Alpine。
 
+<details>
+
+<summary>实验性功能</summary>
+
+用云镜像安装 Debian，适合于 CPU 较慢的机器
+
+```bash
+bash reinstall.sh debian --ci
+```
+
+用 ISO 安装 CentOS, Alma, Rocky, Fedora ，仅支持内存大于 2G 且为动态 IP 的机器
+
+```bash
+bash reinstall.sh centos --installer
+```
+
+用 ISO 安装 Ubuntu ，仅支持内存大于 1G 且为动态 IP 的机器
+
+```bash
+bash reinstall.sh ubuntu --installer
+```
+
+</details>
+
 ### 功能 2: DD
 
-- 支持 `raw`、`vhd`、`gzip`、`xz` 格式的镜像
-- DD Windows 镜像时，会自动扩展系统盘。静态的机器会自动配置好 IP，可能首次开机几分钟后才生效
+- 支持 `raw` `vhd` 或者经过 `xz` `gzip` 压缩的镜像
+- DD Windows 镜像时，会扩展系统盘，静态 IP 的机器会配置好 IP，可能首次开机几分钟后才生效
+- DD Linux 镜像时，**不会**扩展系统盘，静态 IP 的机器**不会**配置好 IP
 
 ```bash
 bash reinstall.sh dd --img https://example.com/xxx.xz
diff --git a/alpine-network.sh b/alpine-network.sh
index 45ab090..74ed983 100644
--- a/alpine-network.sh
+++ b/alpine-network.sh
@@ -129,7 +129,7 @@ test_internet() {
     echo 'Testing Internet Connection...'
 
     # debian 没有 nslookup，因此用 ping
-    for i in $(seq 5); do
+    for i in $(seq 10); do
         if is_need_test_ipv4 && ping -c1 -W5 -I "$ethx" "$ipv4_dns1" >/dev/null 2>&1; then
             echo "IPv4 has internet."
             ipv4_has_internet=true
diff --git a/reinstall.sh b/reinstall.sh
index 54dbcd1..b6f71a4 100644
--- a/reinstall.sh
+++ b/reinstall.sh
@@ -844,6 +844,19 @@ setos() {
                     directory=extended-lts
                     initrd_mirror=archive.debian.org
                 fi
+                if is_in_china; then
+                    warn "
+Due to the lack of Debian Freexian ELTS instaler mirrors in China, the installation time may be longer.
+Continue?
+
+由于没有 Debian Freexian ELTS 国内安装源，安装时间可能会比较长。
+继续安装?
+"
+                    read -r -p '[y/N]: '
+                    if ! [[ "$REPLY" = [Yy] ]]; then
+                        exit
+                    fi
+                fi
             else
                 if is_in_china; then
                     # ftp.cn.debian.org 不在国内还严重丢包
@@ -1089,7 +1102,7 @@ setos() {
         if [ -z "$iso" ]; then
             # 查找时将 windows longhorn serverdatacenter 改成 windows server 2008 serverdatacenter
             image_name=${image_name/windows longhorn server/windows server 2008 server}
-            echo "iso url is not set. Try to find it."
+            echo "iso url is not set. Attempting to find it automatically."
             find_windows_iso
         fi
 
@@ -1424,7 +1437,7 @@ install_pkg() {
                 # https://github.com/chef/os_release
                 case "$id" in
                 fedora | centos | rhel) is_have_cmd dnf && pkg_mgr=dnf || pkg_mgr=yum ;;
-                debian | ubuntu) pkg_mgr=apt ;;
+                debian | ubuntu) pkg_mgr=apt-get ;;
                 opensuse | suse) pkg_mgr=zypper ;;
                 alpine) pkg_mgr=apk ;;
                 arch) pkg_mgr=pacman ;;
@@ -1437,7 +1450,7 @@ install_pkg() {
         fi
 
         # 查找方法 2
-        for mgr in dnf yum apt pacman zypper emerge apk opkg nix-env; do
+        for mgr in dnf yum apt-get pacman zypper emerge apk opkg nix-env; do
             is_have_cmd $mgr && pkg_mgr=$mgr && return
         done
 
@@ -1454,7 +1467,7 @@ install_pkg() {
             ;;
         xz)
             case "$pkg_mgr" in
-            apt) pkg="xz-utils" ;;
+            apt-get) pkg="xz-utils" ;;
             *) pkg="xz" ;;
             esac
             ;;
@@ -1472,14 +1485,14 @@ install_pkg() {
             ;;
         fdisk)
             case "$pkg_mgr" in
-            apt) pkg="fdisk" ;;
+            apt-get) pkg="fdisk" ;;
             apk) pkg="util-linux-misc" ;;
             *) pkg="util-linux" ;;
             esac
             ;;
         hexdump)
             case "$pkg_mgr" in
-            apt) pkg="bsdmainutils" ;;
+            apt-get) pkg="bsdmainutils" ;;
             *) pkg="util-linux" ;;
             esac
             ;;
@@ -1492,7 +1505,7 @@ install_pkg() {
             ;;
         nslookup | dig)
             case "$pkg_mgr" in
-            apt) pkg="dnsutils" ;;
+            apt-get) pkg="dnsutils" ;;
             pacman) pkg="bind" ;;
             apk | emerge) pkg="bind-tools" ;;
             yum | dnf | zypper) pkg="bind-utils" ;;
@@ -1559,9 +1572,9 @@ install_pkg() {
             add_community_repo_for_alpine
             apk add $pkg
             ;;
-        apt)
-            [ -z "$apt_updated" ] && apt update && apt_updated=1
-            DEBIAN_FRONTEND=noninteractive apt install -y $pkg
+        apt-get)
+            [ -z "$apt_updated" ] && apt-get update && apt_updated=1
+            DEBIAN_FRONTEND=noninteractive apt-get install -y $pkg
             ;;
         opkg)
             [ -z "$opkg_updated" ] && opkg update && opkg_updated=1
@@ -1605,7 +1618,7 @@ install_pkg() {
             cmd_to_pkg
             install_pkg_real
         fi
-    done
+    done >&2
 }
 
 check_ram() {
diff --git a/trans.sh b/trans.sh
index dc1411b..28c4c08 100644
--- a/trans.sh
+++ b/trans.sh
@@ -59,13 +59,21 @@ add_community_repo() {
 # 有时网络问题下载失败，导致脚本中断
 # 因此需要重试
 apk() {
-    retry 5 command apk "$@"
+    retry 5 command apk "$@" >&2
 }
 
-# busybox 的 wget 没有重试功能
+# 在没有设置 set +o pipefail 的情况下，限制下载大小：
+# retry 5 command wget | head -c 1048576 会触发 retry，下载 5 次
+# command wget "$@" --tries=5 | head -c 1048576 不会触发 wget 自带的 retry，只下载 1 次
 wget() {
     echo "$@" | grep -o 'http[^ ]*' >&2
-    retry 5 command wget "$@"
+    if command wget 2>&1 | grep -q BusyBox; then
+        # busybox wget 没有重试功能
+        retry 5 command wget "$@"
+    else
+        # 原版 wget 自带重试功能
+        command wget --tries=5 --progress=bar:force "$@"
+    fi
 }
 
 is_have_cmd() {
@@ -396,6 +404,9 @@ is_dmi_contains() {
     cache_dmi_and_virt
     echo "$_dmi" | grep -Eiwq "$1"
 }
+
+show_netconf() {
+    grep -r . /dev/netconf/
 }
 
 get_ra_to() {
@@ -413,6 +424,8 @@ get_ra_to() {
         echo
         ip addr | cat -n
         echo
+        show_netconf | cat -n
+        echo
     fi
     eval "$1='$_ra'"
 }
@@ -1189,6 +1202,7 @@ install_nixos() {
     # 2. 用 nix 安装 nixos-install-tools (nixos-xxx)
     # 3. 运行 nixos-generate-config 生成配置 + 编辑
     # 4. 运行 nixos-install
+    # https://nixos.org/manual/nixos/stable/index.html#sec-installing-from-other-distro
 
     # nix 安装方式                                    分支          版本
     # apk add nix                                    3.20         2.22.0  # nix 本体跟 alpine 正常的软件一样，不在 /nix/store 里面
@@ -2296,8 +2310,8 @@ EOF
             ! sh /can_use_cloud_kernel.sh "$xda" $eths; then
 
             cp_resolv_conf $os_dir
-            chroot $os_dir apt update
-            DEBIAN_FRONTEND=noninteractive chroot $os_dir apt install -y linux-image-$axx64
+            chroot $os_dir apt-get update
+            DEBIAN_FRONTEND=noninteractive chroot $os_dir apt-get install -y linux-image-$axx64
 
             # 标记云内核包
             # apt-mark showmanual 结果为空，返回值也是 0
@@ -2312,12 +2326,12 @@ EOF
 
         if [ "$releasever" -le 11 ]; then
             cp_resolv_conf $os_dir
-            chroot $os_dir apt update
+            chroot $os_dir apt-get update
 
             if true; then
                 # 将 debian 11 设置为 12 一样的网络管理器
                 # 可解决 ifupdown dhcp 不支持 24位掩码+不规则网关的问题
-                DEBIAN_FRONTEND=noninteractive chroot $os_dir apt install -y netplan.io
+                DEBIAN_FRONTEND=noninteractive chroot $os_dir apt-get install -y netplan.io
                 chroot $os_dir systemctl disable networking resolvconf
                 chroot $os_dir systemctl enable systemd-networkd systemd-resolved
                 rm_resolv_conf $os_dir
@@ -2331,7 +2345,7 @@ EOF
 
             else
                 # debian 11 默认不支持 rdnss，要安装 rdnssd 或者 nm
-                DEBIAN_FRONTEND=noninteractive chroot $os_dir apt install -y rdnssd
+                DEBIAN_FRONTEND=noninteractive chroot $os_dir apt-get install -y rdnssd
                 # 不会自动建立链接，因此不能删除
                 restore_resolv_conf $os_dir
             fi
@@ -2666,7 +2680,7 @@ chroot_apt_autoremove() {
     }
 
     change_confs change
-    DEBIAN_FRONTEND=noninteractive chroot $os_dir apt autoremove --purge -y
+    DEBIAN_FRONTEND=noninteractive chroot $os_dir apt-get autoremove --purge -y
     change_confs restore
 }
 
@@ -3010,8 +3024,8 @@ EOF
         # 安装最佳内核
         flavor=$(get_ubuntu_kernel_flavor)
         echo "Use kernel flavor: $flavor"
-        chroot $os_dir apt update
-        DEBIAN_FRONTEND=noninteractive chroot $os_dir apt install -y "linux-image-$flavor"
+        chroot $os_dir apt-get update
+        DEBIAN_FRONTEND=noninteractive chroot $os_dir apt-get install -y "linux-image-$flavor"
 
         # 自带内核：
         # 常规版本             generic
@@ -3032,7 +3046,7 @@ EOF
         # 16.04 镜像用 ifupdown/networking 管理网络
         # 要安装 resolveconf，不然 /etc/resolv.conf 为空
         if [ "$releasever" = 16.04 ]; then
-            chroot $os_dir apt install -y resolvconf
+            chroot $os_dir apt-get install -y resolvconf
             ln -sf /run/resolvconf/resolv.conf $os_dir/etc/resolv.conf.orig
         fi