Failed to resolve packages but I did nothing but create new project

170173-error-message.png
Unity suddenly keeps showing this ugly error message EVERYTIME I make a new project.
It happens when I try to make a 2D Template in 2019.4, 2D/3D in 2020.1.
I tried re-installing over 5 times(with different versions) and none of them works.
Resetting package setting also doesn’t work.
I don’t even understand why nobody complains about this stuff and nobody knows the solution. please help.

seriously? no one?