I am also getting this - on investigation it appears that cyberpanel.sh is blocking certain IP ranges. In my case they are both in South Africa but on different hosts. If I run the VPS through a VPN and change the IP address to one elsewhere (like Germany) then the installation continues.
However on restart of services the IP address goes back to a South African one and it cannot continue. So am also stuck with this.
One VPS is Alma8 and the other is Ubuntu 20.04, both completely new with updates done.
I am having this issue as well and have tried from two different service providers in the Caribbean. I haven’t tried this from a Cloud VPS yet. Thank you for posting as I did not know what to make of this when I tried to test the panel for the first time. Edit: This is on Ubuntu 22.04, same as OP.
From 2 servers in ZA
response:
Looking up cyberpanel.sh
Making HTTPS connection to cyberpanel.sh
Retrying connection without TLS.
Looking up cyberpanel.sh
Making HTTPS connection to cyberpanel.sh
Alert!: Unable to make secure connection to remote host.