I am using Ubuntu 18.04, and I want to install Unity 2019.4.2f which my team uses.
But I can't find the older version, but only the latest version 2019.4.5f1(LTS) on the install page of Unity Hub.
The Unity Hub installation link in Unity Archive website is also not working. And I can't find the installion file for Linux.
Older versions can be found on Unity's website: https://unity3d.com/get-unity/download/archive. Once you click the download link, it will prompt you to install on your Unity Hub.
What do you mean by the unity archive not working?