最新版地址：

https://repo.steampowered.com/steam/archive/stable/steam_latest.deb

解决直安deb包提示签名缺少公钥问题：

查了几个公钥注册服务器，还真没查到这个公钥......只能老实找官网的签名了

参照安装文档，
https://repo.steampowered.com/steam/

Installing via apt 安装说明：

下载拷贝GPG签名文件

Download steam.gpg and copy it to /usr/share/keyrings/steam.gpg, then run:

创建软件源及更新安装

$ sudo tee /etc/apt/sources.list.d/steam-stable.list <<'EOF'
deb [arch=amd64,i386 signed-by=/usr/share/keyrings/steam.gpg] https://repo.steampowered.com/steam/ stable steam
deb-src [arch=amd64,i386 signed-by=/usr/share/keyrings/steam.gpg] https://repo.steampowered.com/steam/ stable steam
EOF
$ sudo dpkg --add-architecture i386
$ sudo apt-get update
$ sudo apt-get install 
libgl1-mesa-dri:amd64 
libgl1-mesa-dri:i386 
libgl1-mesa-glx:amd64 
libgl1-mesa-glx:i386 
steam-launcher