V2 to V3 upgrade - Cerftificate verification failed

Sonarr version (exact version): 2.0.0.5344 (upgrading to latest
Mono version (if Sonarr is not running on Windows): 4.2.3
OS: Ubuntu 16.04.6 LTS
Debug logs:

nas@SuperNas:~$ sudo apt update
[sudo] password for nas: 
Hit:1 http://au.archive.ubuntu.com/ubuntu xenial InRelease
Hit:2 http://au.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:3 http://au.archive.ubuntu.com/ubuntu xenial-backports InRelease
Hit:4 http://au.archive.ubuntu.com/ubuntu xenial-security InRelease
Hit:5 https://downloads.plex.tv/repo/deb public InRelease
Ign:6 https://apt.sonarr.tv/ubuntu xenial InRelease
Err:7 https://apt.sonarr.tv/ubuntu xenial Release
  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
Reading package lists... Done
E: The repository 'https://apt.sonarr.tv/ubuntu xenial 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.

Description of issue:
Update to V3 not proceeding when following instructions at Sonarr - Dive in

Additional information - I found this issue PPA Repository Certificate · Issue #4813 · Sonarr/Sonarr · GitHub

it looks the same as the one i have , however, the resolution did not work for me. update-ca-certificates did not resolve the issue

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