Installation document

Could anyone give me a proper XWiki install procedure guide or link?
I want to install on ubuntu 20.04 with maria DB

Hi,

you can follow this documentation: https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/Installation/InstallationViaAPT/

Which connector I can use?

I don’t know what you’re talking about. If you want help provide a bit more context.