Ubuntu

The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY B53DC80D13EDEF05

GPG error: http://packages.cloud.google.com/apt google-cloud-monitoring-focal-all InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY B53DC80D13EDEF05

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys <THE PUB KEY IN QUESTION>

i.e. for this specific key “B53DC80D13EDEF05” being reported Run the following command

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys B53DC80D13EDEF05

Executing: /tmp/apt-key-gpghome.5ZVvtULX98/gpg.1.sh –keyserver hkp://keyserver.ubuntu.com:80 –recv-keys B53DC80D13EDEF05
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

sudo apt update 

all should be good now