Invalid Signature

Good Morning everyone
I’ve some problem trying to install GlobaLeaks on Ubuntu 18.04.
GPG error: hhtps://deb.globaleaks.org bionic/ Release: The Following sinfatures were invalid: BADSIG 32E6792624045008 GlobaLeaks software signing key info@globaleaks.org
E: The repository ‘http://deb.globaleaks.org bionic/ Release’ is not signed.

How can i solve it?

Thank you everyone.

Buongiorno a tutti,
ho il suddetto problema durante l’installazione su una Ubuntu 18.04
Qualche idea su come risolverlo?

Grazie a tutti