Openbullet works on linux, very easily, and has a nice web-gui you can use.
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https://docs.openbullet.dev/docs/installation/linux/
http://localhost:5000 (if you need public access, install a OpenVPN server and connect to the VPN to access the internal network of your VPS: https://github.com/angristan/openvpn-install)
Code:
sudo apt install -y wget
wget https://github.com/openbullet/openbullet2/releases/latest/download/ob2-web-updater-linux-x64
chmod +x ./ob2-web-updater-linux-x64
./ob2-web-updater-linux-x64
dotnet ./OpenBullet2.Web.dll