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The following security updates require Ubuntu Pro with 'esm-infra' enabled
the file /etc/apt/apt.conf.d/20apt-esm-hook.conf provides the hook that calls the marketing message generation. Removing that is an option[1]
sudo mv /etc/apt/apt.conf.d/20apt-esm-hook.conf /var/tmp
after then run apt upgrade the message does not show
How to cleanly remove x11[2]
sudo apt purge 'x11-*'
sudo apt autoremove
apt-get update “the following signatures couldn’t be verified because the public key is not available”
$ sudo apt update
Err:5 https://packages.cloud.google.com/apt kubernetes-xenial InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B53DC80D13EDEF05
#need to add the missing Key B53DC80D13EDEF05
$sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys B53DC80D13EDEF05
Executing: /tmp/apt-key-gpghome.xfmtcCbrXz/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys B53DC80D13EDEF05
gpg: key B53DC80D13EDEF05: 1 duplicate signature removed
gpg: key B53DC80D13EDEF05: public key "Rapture Automatic Signing Key (cloud-rapture-signing-key-2022-03-07-08_01_01.pub)" imported
gpg: Total number processed: 1
gpg: imported: 1
#now update will be successful