When I run sudo apt-get update on my fully updated Ubuntu 16.04.6 LTS I get the following errors about Google repositories:

$ sudo apt update ... Err:20 stable Release.gpg The following signatures were invalid: KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 Get:21 xenial-backports InRelease [107 kB] Err:13 stable Release.gpg The following signatures were invalid: KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 ... W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: stable Release: The following signatures were invalid: KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: stable Release: The following signatures were invalid: KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 W: Failed to fetch The following signatures were invalid: KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 W: Failed to fetch The following signatures were invalid: KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 KEYEXPIRED 1555048520 W: Some index files failed to download. They have been ignored, or old ones used instead.

The apt-key list returns:

pub 1024D/7FAC5991 2007-03-08 uid Google, Inc. Linux Package Signing Key <> sub 2048g/C07CB649 2007-03-08 pub 4096R/D38B4796 2016-04-12 uid Google Inc. (Linux Packages Signing Authority) <> sub 4096R/997C215E 2017-01-24 [expires: 2020-01-24]

Removing Google keys and packages with 

sudo apt-key del D38B4796 sudo apt-key del 7FAC5991 sudo apt purge google-chrome-stable sudo apt purge google-earth-pro-stable sudo apt purge google-earth-stable

and reinstalling packages with 

cd ~/Downloads wget sudo apt-get install --reinstall ./google-chrome-stable_current_amd64.deb wget sudo apt-get install --reinstall ./google-earth-pro-stable_current_amd64.deb

does not help.

Executing command from :

wget -q -O - | sudo apt-key add -

does not help.

How should I fix it?

What else I did:
1. sent feedback from Google Chrome with Help → Report an Issue.
2. sent feedback from Google Earth using Help → Send feedback.
3. created thread on Google Chrome Help

4

4 Answers

It's fixed on Google's end now, so you can update normally through apt without workarounds.

(Sorry, can't comment due to <50 reputation.)

Current status on Ubuntu 16.04 LTS:

  • Google Chrome repository updated successfully.
  • Google Earth repository updated successfully.

If you still have issues - then remove GPG keys and re-add GPG key into the system with

sudo apt-key del D38B4796 sudo apt-key del 7FAC5991 wget -q -O - | sudo apt-key add -

or

sudo apt-key net-update sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys D38B4796 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 7FAC5991 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1397BC53640DB551

and update package lists:

sudo apt-get update

I also had to remove chrome-remote-desktop with

sudo apt purge chrome-remote-desktop

to avoid leftover complains at update runtime.

Just leaving it here... Similar error occurs in Azure DSVM when upgrading it. Following will update the keys

curl | sudo apt-key add - sudo apt update