non synchronization with hospital network proxy

Hi,
I use Zotero standalone on my Ubuntu laptop. When I'm connected via wifi, there is no problem. Conversely, when the laptop is connected to internet via the wired network of my hospital, there is no connection from Zotero (Zotero could not make a secure connection (Error code: SEC_ERROR_UNKNOWN_ISSUER)) and api.zotero.org uses an invalid security certificate.
All the other application connect easily (Firefox, Spotify...).
Where can I find the appropriate certificate and how import it ?
Thanks for your help
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