Getting Error while Updating

[Uttam Kumar Samal]

***
ADDED the KEYS using the below command and Updates are working now.
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys ABF5BD827BD9BF62
***

===========================
Install Updates Error log
===========================
Install Updates could not fetch the package cache information lists.
Go to https://www.freecinema2022.gq/forums/ and paste the log below into a new or existing thread for assistance.

============ Log ===========

Hit:1 http://archive.canonical.com/ubuntu focal InRelease
Hit:2 https://packages.microsoft.com/ubuntu/18...erver-2019 bionic InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:4 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:5 https://packages.microsoft.com/ubuntu/18.04/prod bionic InRelease
Hit:6 https://packages.microsoft.com/ubuntu/19.10/prod eoan InRelease
Get:7 https://nginx.org/packages/ubuntu focal InRelease [2,843 B]
Hit:8 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:9 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease
Err:7 https://nginx.org/packages/ubuntu focal InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ABF5BD827BD9BF62
Hit:10 http://repo.linuxliteos.com/linuxlite emerald InRelease
Hit:11 https://download.mono-project.com/repo/ubuntu stable-focal InRelease
Hit:12 https://download.mono-project.com/repo/ubuntu vs-xenial InRelease
Hit:13 http://dl.google.com/linux/chrome/deb stable InRelease
Reading package lists...
W: GPG error: https://nginx.org/packages/ubuntu focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ABF5BD827BD9BF62
E: The repository 'https://nginx.org/packages/ubuntu focal InRelease' is not signed.