replace your source with tuna speed up apt-update : https://mirrors.tuna.tsinghua.edu.cn/help/ubuntu/
this is for ubuntu , but igeuss it will working well on other linux machines too.
- download Qv2ray here: https://github.com/Qv2ray/Qv2ray/releases
- download v2ray-core here (linux-64 ver):https://github.com/v2ray/v2ray-core/releases
- before open Appimage file you should give it permission! :
chmod 777 * - set up subscribe follow this instruction :https://qv2ray.net/getting-started/step3.html#通过订阅地址导入