目前支持Ubuntu 18.04/20.04/22.04 amd64 架构的操作系统通过APT源直接安装二进制软件包。步骤如下：
1. 添加gpg 文件
sudo apt-get update
sudo apt-get install ca-certificates curl gnupg
sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://njet.org.cn/download/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/njet.gpg
sudo chmod a+r /etc/apt/keyrings/njet.gpg
2. 添加APT源
echo \
"deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/njet.gpg] https://njet.org.cn/download/linux/ubuntu \
$(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
sudo tee /etc/apt/sources.list.d/njet.list > /dev/null
sudo apt-get update
3. 安装及启动
sudo apt-get install njet
sudo systemctl start njet