How can I enable silent automatic updates for Google Chrome?

Installing Google Chrome causes a third-party software source to be added from which Google Chrome upgrades can be retrieved:

$ cat /etc/apt/sources.list.d/google-chrome.list
### THIS FILE IS AUTOMATICALLY CONFIGURED ###
# You may comment out this entry, but any other modifications may be lost.
deb http://dl.google.com/linux/chrome/deb/ stable main

$ head -n 9 /var/lib/apt/lists/dl.google.com_linux_chrome_deb_dists_stable_Release
Origin: Google, Inc.
Label: Google
Suite: stable
Codename: stable
Version: 1.0
Date: Tue, 04 Oct 2011 00:57:43 +0000
Architectures: i386 amd64
Components: main
Description: Google chrome-linux repository.

$ grep '^Package: ' /var/lib/apt/lists/dl.google.com_linux_chrome_deb_dists_stable_main_binary-amd64_Packages 
Package: google-chrome-beta
Package: google-chrome-stable
Package: google-chrome-unstable

How can I enable unattended upgrades from this repository?

1. Install unattended upgrades:

   sudo apt-get install unattended-upgrades
   

2. Enable unattended updates on the Google Chrome repo by editing the unattended upgrades list and adding the Google Chrome repo in it:

   sudo gedit /etc/apt/apt.conf.d/50unattended-upgrades
   

   Add "Google\, Inc.:stable"; to the allowed origins:

   Unattended-Upgrade::Allowed-Origins {
       "${distro_id} ${distro_codename}-security";
   //  "${distro_id} ${distro_codename}-updates";
   //  "${distro_id} ${distro_codename}-proposed";
   //  "${distro_id} ${distro_codename}-backports";
    "Google LLC:stable";
   };
   

3. Test

   Use sudo unattended-upgrade --dry-run to test, if all came clear you should be having updates to Google Chrome installed without any intervention from you.

To check that it's working tail the log after the dry run:

cat /var/log/unattended-upgrades/unattended-upgrades.log

and you should see something along the lines of this in your log:

2011-10-11 18:03:23,292 INFO Allowed origins are: ['o=Ubuntu,a=oneiric-security', 'o=Google, Inc.,a=stable']

You can change the configuration of the unattended updates by editing the file /etc/apt/apt.conf.d/10periodic, options for the configuration are in the /etc/cron.daily/apt script header. Read them to configure the frequency of the unattended updates.

Edit /etc/apt/apt.conf.d/50unattended-upgrades and add a line inside Origins-Pattern:

Unattended-Upgrade::Origins-Pattern {
        // Keep existing content here, just add:
        "origin=Google LLC,codename=stable";                              
}