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Error installing pgadmin

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I want to install postgres on my ubuntu environment, i run the sudo apt-get update which i beleive is the first step of the installation. I keep getting the below error output

The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8881B2A8210976F2 Reading package lists... Done

N: **Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'http://apt.postgresql.org/pub/repos/apt hirsute-pgdg InRelease' doesn't support architecture 'i386'**
W: **GPG error: https://ftp.postgresql.org/pub/pgadmin/pgadmin4/apt/hirsute pgadmin4 InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8881B2A8210976F2**
E: **The repository 'https://ftp.postgresql.org/pub/pgadmin/pgadmin4/apt/hirsute pgadmin4 InRelease' is not signed.**
N: **Updating from such a repository can't be done securely, and is therefore disabled by default.**
See below screenshoot

apt-get update error

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