Unity3D Linux does not save external tool (Rider)

Hey,

I've always used Unity3D on Linux with JetBrains Rider as my IDE.
This all used to work perfectly yet now it stopped recognizing Rider and resetting every startup to VSCode.

I used to work on Ubuntu 18.04 LTS but recently updated to 20.04..
I use Unity3D Linux 2020.3.15f2 and Rider 2020.3.4 ( I also tried 2021) but still things do not properly work.
Also, I don't get the "Rider" menu in my "Preferences" window in Unity.

I also tried all of the versions the Rider editor plugin available in the Unity3d Package Manager.

Does anyone else have this issue and can help me solve it?

 

I fixed this by deleting the unity hub I downloaded though the Ubuntu Software center and reinstalling it manually.