Hi roket147
I found a similar post that makes sense. The public key was rotated.
Manually installing the gpg key from the passbolt server should allow you to run the install again and have the repo key.
wget -qO- https://download.passbolt.com/pub.key |\
gpg --dearmor | sudo tee /usr/share/keyrings/passbolt-repository.gpg > /dev/null
gpg --with-colons --show-keys pub.key | awk -F: '/^fpr:/ {print substr($10, length($10)-15)}'
DE8B853FC155581D
F45AAAF3AA71210F
They you can run the install script again and it should succeed.
Edit: the repository https://download.passbolt.com/ce/ also has instructions
I hope that helps!
cheers
gareth