Hello @spb ,
Indeed, you are probably running passbolt < 3
Since v4, there is some major changes, starting with the minimum software requirement being PHP 7.4. I see on the healthcheck that you are running PHP 7.3, could it be because you are on Debian 10?
If that is the case, I do not recommend to manually update the php version, I highly suggest to take a look at our migration guides in order to migrate to a new server. If you don’t want to be pressure by time you can take a look at this temporary workaround
However, prior to do any changes, please do not forget to do a backup of all your data.