How To add new Repository?

I’m trying to get Unity3D UnityHUB installed from terminal works for ubuntu but I’m puzzled how to do that on manjaro

sudo sh -c 'webpage.reporsitory'

works on ubuntu but I can’t find how to make that on manjaro I can’t find it on web

would appreciate your time
thanks

Packages from repositories (and PPAs) for Ubuntu are not compatible with Manjaro, nor any Arch-based distribution.

There is a unityhub package in AUR that may suit you instead.

The UnityHub is also availabe as an AppImage via their official download page. Just use the "Download Unity Hub" button. It will notify you when there is an update for it available.

If you want to use Unity3D - do yourself a favor - use a supported platform.

System requirements

OS: Windows 7 SP1+, 8, 10, 64-bit versions only; Mac OS X 10.12+; Ubuntu 16.04, 18.04, and CentOS 7.

GPU: Graphics card with DX10 (shader model 4.0) capabilities.
Download - Unity

If you really must use Manjaro - you are on your own - as unity3d is a custom package and custom packages are unsupported.