启用WSL并下载Ubuntu等系统发行版后，你会发现打开的只有一个纯英文的命令行界面。而且，apt使用起来巨卡，有时还会断连。
所以，还是乖乖地安装中文语言包并更换国内apt源吧。
将以下内容复制到终端，中途要密码就输，确认操作都回答y：
sudo su
apt-get install language-pack-zh-han*
apt-get install $(check-language-support)
echo "LANG=\"zh_CN.UTF-8\"" > /etc/default/locale
echo "LANGUAGE=\"zh_CN:zh\"" >> /etc/default/locale
echo "LC_NUMERIC=\"zh_CN\"" >> /etc/default/locale
echo "LC_TIME=\"zh_CN\"" >> /etc/default/locale
echo "LC_MONETARY=\"zh_CN\"" >> /etc/default/locale
echo "LC_PAPER=\"zh_CN\"" >> /etc/default/locale
echo "LC_NAME=\"zh_CN\"" >> /etc/default/locale
echo "LC_ADDRESS=\"zh_CN\"" >> /etc/default/locale
echo "LC_TELEPHONE=\"zh_CN\"" >> /etc/default/locale
echo "LC_MEASUREMENT=\"zh_CN\"" >> /etc/default/locale
echo "LC_IDENTIFICATION=\"zh_CN\"" >> /etc/default/locale
echo "LC_ALL=\"zh_CN.UTF-8\"" >> /etc/default/locale
echo "LANG=\"zh_CN.UTF-8\"" >> /etc/environment
echo "LANGUAGE=\"zh_CN:zh\"" >> /etc/environment
echo "LC_NUMERIC=\"zh_CN\"" >> /etc/environment
echo "LC_TIME=\"zh_CN\"" >> /etc/environment
echo "LC_MONETARY=\"zh_CN\"" >> /etc/environment
echo "LC_PAPER=\"zh_CN\"" >> /etc/environment
echo "LC_NAME=\"zh_CN\"" >> /etc/environment
echo "LC_ADDRESS=\"zh_CN\"" >> /etc/environment
echo "LC_TELEPHONE=\"zh_CN\"" >> /etc/environment
echo "LC_MEASUREMENT=\"zh_CN\"" >> /etc/environment
echo "LC_IDENTIFICATION=\"zh_CN\"" >> /etc/environment
echo "LC_ALL=\"zh_CN.UTF-8\"" >> /etc/environment
echo "deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse" > /etc/apt/sources.list
echo "deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse" >> /etc/apt/sources.list
echo "deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse" >> /etc/apt/sources.list
echo "deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse" >> /etc/apt/sources.list
echo "deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse" >> /etc/apt/sources.list
echo "deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse" >> /etc/apt/sources.list
echo "deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse" >> /etc/apt/sources.list
echo "deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse" >> /etc/apt/sources.list
echo "deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse" >> /etc/apt/sources.list
echo "deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse" >> /etc/apt/sources.list
apt-get update
apt-get upgrade
reboot