Hello Aleks-
Thank you once again for your response.
Following your response, I re-ran the installation process from the exact server where the first installation was attempted: It did not work (An error message displayed indicating something to the effect that YunoHost wasnot able to resume the installation from where it had stalled).
So I went ahead and reinitialized the VPS entirely, going back to the “bare” Debian 9 (64 bit) distribution. From there, I re-ran the installation of YunoHost
curl https://install.yunohost.org | bash
And it worked like a charm this time! 
I don’t know what was fixed in the yesterday’s build but it solved the problem!
Thank you very much for your help.
Cheers,
Eric