At least here in Europe, Hetzner is a good supplier of dedicated servers.
Good price and excellent quality and features.
But I’ve been in despair for almost two weeks to get a working HestiaCP installation.
Despair becomes panic when you realize that other panels work and Hestia is in chaos.
But without stress …
I understand the problem.
Hetzner uses its own linux templates that for one or several reasons are incompatible with HestiaCP.
To solve the problem definitively, you have to install Debian or Ubuntu using the “rescue” option.
IMPORTANT, you do not install Linux directly through the Hetzner panel.
1- You enter the Rescue option
2- Reset System
3- Enter as root and type:
root @ rescue ~ #installimage
4- Then follow the steps indicated
5- VERY IMPORTANT
Hetzener automatically configures your DNS, it is imperative to change the respective files
DEBIAN:
nano /etc/resolv.conf
nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 2001: 4860: 4860 :: 8888
nameserver 2001: 4860: 4860 :: 8844
UBUNTU: Google it 
https://docs.hetzner.com/robot/dedicated-server/operating-systems/installimage
Hope this helps