Just done my first Hestia install ever and jumped straight to Debian 10. I never understand the fascination with Ubuntu as a server OS - Debian/CentOS for goodness’ sake! (From a UNIX purist perspective). 
With the supplied VPS provider’s template, I needed to install curl - first hurdle passed.
Received two errors about SSL though - should’ve copied them down - I’ll see if it is logged someplace.
Is Hestia supposed to install a LE certificate for the host automatically, or stick with the self-certified one? When I asked for an LE for the admin web site (the same FQDN), it installed, with no problem.
BTW, it’s excellent that the default admin account attaches to the hostname - not all control panels have the foresight to do this. Well done! 