EXPKEYSIG debian ubuntu

Fix EXPKEYSIG 78BD65473CB3BD13

Google Chrome <linux-packages-keymaster@google.com> — by Google

Official Key Page: https://www.google.com/linuxrepositories/
Error message 
EXPKEYSIG 78BD65473CB3BD13 Google Chrome <linux-packages-keymaster@google.com>

Your distro

Fix commands for Generic (GnuPG)

Method 1 GnuPG keyserver lookup

Fetches the key from a public keyserver using GnuPG. Works on any distro with gpg installed.

Generic (GnuPG) — bash
$ gpg --keyserver keyserver.ubuntu.com --recv-keys 78BD65473CB3BD13
$ gpg --list-keys 78BD65473CB3BD13
Official documentation

Method 2 Direct download

Downloads and imports the key file directly from the vendor.

Generic (GnuPG) — bash
$ curl -fsSL https://dl.google.com/linux/linux_signing_key.pub | gpg --import
Official documentation

Additional notes

Google rotates its Linux repo signing key periodically. If this fix stops working, check the official page for the current key fingerprint.

After importing the key

Run sudo apt-get update (or your distro's equivalent) again. If successful you should see Hit: lines with no EXPKEYSIG warnings. Still broken? Check that your /etc/apt/sources.list.d/ entry references the correct [signed-by=…] keyring path.