Do I need to run robot framework tests without a display at all?

I am preparing several test suites for an e-commerce website, so I am using Selenium2Library, which requires a desktop browser. I can run these tests on my local machine, but I had to run them on a remote server that has no actual display. I tried to use xvfb to create a virtual display but it didn't work, tried all solutions on some answers here but nothing changed.

So, I saw the pyvirtualdisplay Python library, but it seems to be useful with tests written in Python. I would like to know that if I can run the test packages I wrote in robotframework (which are formatted .txt and can be run via pybot) via Python, so I can use pyvirtualdisplay?

Sorry for my english, thanks for your answers ...