Unity stuck on "Importing" while starting Unity 2020

Try deleting (or moving to your Desktop) the Library folder in the root of your project. It contains Unity's cache which might be corrupted. Next time you open the project it should take a much longer time than usual to reimport everything.

Same issue here, if I exit Unity via taskbar and relaunch it works back, but, as soon as PC is restarted the issue may reappear.

[Solved] Auro-response: I found that, the PC experiencing this issue, had a malwhare and, after removing it, everything started to work as usual. So, take a look at your running processes and services and an antivirus scan should help as well.

A corrupted asset can cause this. If deleting Library and opening the project again doesn't help, then check the Editor logs. Do this after closing/crashing the application and you may be able to find what it's getting tripped up on. See here: https://docs.unity3d.com/Manual/LogFiles.html under the Editor header to find out where those are on your machine. There have been problems importing various file types in certain software configurations / unity versions / operating systems over the years.

Ooof, don't delete you meta files. Your library is probably corrupt, delete the Library folder, it will regenerate the database from the metafiles.

This question appears in three places online, and the only answer it has anywhere is, "That's a serious problem," on Reddit. Amazing.

This worked for me:

1. Delete every .meta file in your assets folder.

2. Delete every project (Visual Studio or Jetbrains Rider) file in your root project folder.

3. Restart your machine and try again.

This forces it to regenerate everything, so you'll still have to wait for it to import. But you'll notice in Task Manager that CPU usage is no longer 0%, and the editor will launch in the end.