Can't install hestia

Hey
I can’t install the panel
the server has a clean ubuntu 20.04 installed
when I try to install the panel, I see

Updating currently installed packages, please wait ... E: The repository 'https://apt.hestiacp.com focal Release' does not have a Release file. -
The installer is now downloading and installing all required packages.
NOTE: This process may take 10 to 15 minutes to complete, please wait ... -
Error: apt-get install failed

tried:

sudo apt update
Hit: 1 http://ru.archive.ubuntu.com/ubuntu focal InRelease
Get: 2 http://ru.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Ign: 3 https://apt.hestiacp.com focal InRelease
Hit: 4 http://ppa.launchpad.net/ondrej/apache2/ubuntu focal InRelease
Get: 5 http://ru.archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]
Err: 6 https://apt.hestiacp.com focal Release
  Could not handshake: Error in the pull function. [IP: 172.67.131.50 443]
Hit: 7 http://ppa.launchpad.net/ondrej/php/ubuntu focal InRelease
Get: 8 http://ru.archive.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Hit: 9 https://mirror.mva-n.net/mariadb/repo/10.5/ubuntu focal InRelease
Get: 10 http://archive.canonical.com/ubuntu focal InRelease [12.1 kB]
Hit: 11 https://nginx.org/packages/mainline/ubuntu focal InRelease
Get: 12 http://archive.canonical.com/ubuntu focal / partner amd64 Packages [856 B]
Get: 13 http://archive.canonical.com/ubuntu focal / partner Translation-en [384 B]
Reading package lists ... Done
E: The repository 'https://apt.hestiacp.com focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure (8) manpage for repository creation and user configuration details.

how to fix it?