中文man手册安装包地址https://src.fedoraproject.org/repo/pkgs/man-pages-zh-CN/
wget https://src.fedoraproject.org/repo/pkgs/man-pages-zh-CN/manpages-zh-1.5.1.tar.gz/13275fd039de8788b15151c896150bc4/manpages-zh-1.5.1.tar.gz
tar fx manpages-zh-1.5.1.tar.gz
cd manpages-zh-1.5.1
./configure --disable-zhtw --prefix=/usr/local/zhman
make && make install
echo "alias cman='man -M /usr/local/zhman/share/man/zh_CN' " >>/root/.bash_profile
source .bash_profile
清华大学软件镜像站
https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu/