I am trying to upgrade from Passbolt 3.5.0-2 to 3.5.0-3; as stated in the docs  since repo GPG key is expired I proceeded to install the new one and remove the expired one manually.
If I run “apt-keys list” the key shows up, “apt update” is executed normally and everything seems fine.
“apt upgrade” fails with two interesting errors:
- key 0x<key_fingerprint> not found.
- GPG keyserver connection timedout.
The even more interesting thing is that, after running “apt upgrade” if I execute “apt-keys list” the key is not there anymore, almost like if the installer is actually removing it and then trying to get the supposedly new key, even if was still there imported by me manually, from a keyserver on the interwebz.
My passbolt install is residing in a restricted network where access to the internet is mediated by a HTTP/HTTPS proxy.
apt is configured to use the above mentioned HTTP/HTTPS proxy to reach the internet but passbolt isn’t, which I assume is causing that “GPG keyserver connection timedout” error.
Do you have any idea how I can solve this?