While running sudo apt update the following Warning, followed by an Error raises:
W: GPG error: http://packages.cloud.google.com/apt cloud-sdk InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B53DC80D13EDEF05
E: The repository 'http://packages.cloud.google.com/apt cloud-sdk InRelease' is not signed.
Does anybody know how can I solve it?
This is a known issue.
https://cloud.google.com/compute/docs/troubleshooting/known-issues#keyexpired
Updated 2024:
apt-key is deprecated, the new way is to store the keys in separate files.
Get the latest key with:
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo gpg --dearmor -o /usr/share/keyrings/google-keyring.gpg
and use [signed-by=/usr/share/keyrings/google-keyring.gpg] in package definition file in /etc/apt/sources-list.d/:
deb [signed-by=/usr/share/keyrings/google-keyring.gpg] https://packages.cloud.google.com/apt cloud-sdk main
Original answer (deprecated)
Run the following command to obtain the latest key:
wget https://packages.cloud.google.com/apt/doc/apt-key.gpg \
&& apt-key add apt-key.gpg
or
curl -O https://packages.cloud.google.com/apt/doc/apt-key.gpg \
&& apt-key add apt-key.gpg
or.. if you like it simple without extraneous files and are feeling adventurous:
curl -f https://packages.cloud.google.com/apt/doc/apt-key.gpg \
| sudo apt-key add -