Unity crashes when loading an image in Animation tab on Ubuntu

Unity crashes most of the time when I try to load an image in the Animation timeline.

I use Unity 2020.3.1f1 on Ubuntu 20.04. I created a 2D project. I want to include some animations. So I create a new Animation, drag and drop a first picture in the timeline and at this moment Unity crashes (~80% of the time). I have the same behavior with all the images I tried.

Is there something I am doing wrong ? Is this a know problem on Ubuntu maybe ? I don't find much informations about this problem. How can I solve it ?