#修改源为清华大学
sudo \cp -f /etc/apt/sources.list /etc/apt/sources.list_bak_`date +"%Y年%m月%d日%H-%M-%S"`;
sudo echo 'deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse' >/etc/apt/sources.list;
sudo apt-get update
sudo apt-get upgrade
#安装ssh 服务 并允许root用ssh登录
sudo apt-get install openssh-server
sudo apt-get install openssh-server
sudo \cp -f /etc/ssh/sshd_configt /etc/ssh/sshd_config_bak_`date +"%Y年%m月%d日%H-%M-%S"`;
sudo echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config
sudo /etc/init.d/ssh restart
#安装rz
apt-get install lrzsz