apk add curl&&apk add bash && bash <(curl -Ls https://raw.githubusercontent.com/Lynn-Becky/Alpine-x-ui/main/alpine-xui.sh)

重启面板命令：

/etc/init.d/x-ui restart

去除Shell脚本的r字符：

方法1

sed -i 's/\r//' your.sh

方法2

dos2unix your.sh

your.sh改成你的真实脚本名称，方法2需要先安装dos2unix

由于debian9 停止维护，目前可用的软件源如下：

deb http://archive.debian.org/debian/ stretch main contrib non-free
deb-src http://archive.debian.org/debian/ stretch main contrib non-free
deb http://archive.debian.org/debian-security/ stretch/updates main contrib non-free
deb-src http://archive.debian.org/debian-security/ stretch/updates main contrib non-free
deb http://archive.debian.org/debian/ stretch-backports main contrib non-free

1.设置软件源

cat >/etc/apt/sources.list<<EOF
deb http://archive.debian.org/debian/ stretch main contrib non-free
deb-src http://archive.debian.org/debian/ stretch main contrib non-free
deb http://archive.debian.org/debian-security/ stretch/updates main contrib non-free
deb-src http://archive.debian.org/debian-security/ stretch/updates main contrib non-free
deb http://archive.debian.org/debian/ stretch-backports main contrib non-free
EOF

2.更新软件源： apt update -y

3.提示gpg证书错误处理

报错信息：

W: GPG error: http://archive.debian.org/debian stretch-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 648ACFD622F3D138 NO_PUBKEY 0E98404D386FA1D9
安装需要的依赖和软件：

apt-get install software-properties-common dirmngr -y

添加gpg证书验证：

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 648ACFD622F3D138 0E98404D386FA1D9

解决方法：
1、修改配置文件

vi /etc/ssh/sshd_config

将Subsystem sftp /usr/libexec/openssh/sftp-server修改为Subsystem sftp internal-sftp

2、重启sshd服务

service sshd restart

find /var/log -type f -exec truncate -s 0 {} \;

find /var/log：在/var/log目录下查找。
-type f：只查找文件。
-exec truncate -s 0 {} ;：对找到的每个文件执行truncate命令，将其大小设置为0。