While running update command after some time we were getting GPG error. It was showing an error message with public key => EAA903E3A2F4C039 not found.
Solution:
Run following command to solve this problem:
sudo apt-key adv –recv-keys –keyserver keyserver.ubuntu.com EAA903E3A2F4C039
EAA903E3A2F4C039 is the key that I was getting in the error, it will be different for different systems.
apt-key Command Description:
apt-key is used to manage the list of keys used by apt to authenticate packages. Packages which have been authenticated using these keys will be considered trusted.
adv flag
adv – Pass advanced options to gpg. With adv –recv-key you can download the public key.
By running above command we added missing public key to the system and it works.
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