Hi AI
In fact it's quite simple:
1 - Download GB to your Linux VPS and unzip it as usual
2 - Chmod +x gunthy-gui-linx64 guinthy-linx64
2 - Run gunthy-gui-linx64 with ./gunthy-gui-linx64. It will point to localhost:5000 <- do not consider it
4 - Instead, in your browser in your local computer, use the IP you use to reach your VPS using SSH, like 123.124.125.126:5000
It should open the Gui and prompt you to create a password.
If it doesn't help, send me a screenshot with the error, but I'm sure it will work
Best regards