Installing add-ons fails

I’m new to HASS, thinking about migrating from openHAB
Whenever I try to install or remove an add-on there’s the waiting icon forever.
When I click a different menu item, I get the response, but the installation or removal of the add-on doesn’t get done.
On a top command in an open SSH screen, I see the system is not loaded at all.
Any ideas how to further debug ?

Hello, maybe you have a picture of it ?

What install method did you use?

Have you set up your DNS in Settings → System → Network ?

Thanks for the help.
Got solved by using a different µSD card and configuring the Wifi.
Starting to suspect a problem with the local switch or LAN cabling.