A summary about this bug and the proposed fixes:

Many users report that the google account needs to be reauthenticated often 
(even everyday).
I couldn't personally reproduce it, so I cannot give a detailed explanation; if 
you are affected by this bug, it just happens that the system indicator will 
turn red and that the Google account will be markes as needing 
reauthentication. Sometimes after one day, sometimes after one week (different 
users have reported different times).

The proposed fix changes the google authentication process in order to
take the OAuth "refresh tokens" into use; refresh tokens have an
expiration date much farther away then access tokens, that are usually
short lived.

The linked branches from account-plugins and signon-plugin-oauth2 are
both essential for the resolution of this bug: the first one is a change
to the account settings, which makes the Google plugin authenticate
using a different method, which takes the OAuth "refresh tokens" into
use; the change in the signon-plugin-oauth2 fixes the problem where the
refresh token was getting deleted from the database.

The risk impact is minimal: the change to the Google plugin (in account-
plugins) simply changes the authentication method, in a way that is
well-documented. The change in signon-plugin-oauth2 affects only those
accounts/providers which use the refresh tokens -- which is only Google,
at the moment -- and in a way that can't possibly break any existing
functionality; if the new code had some mistake, the situation would be
in any case not worse than the previous one.

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https://bugs.launchpad.net/bugs/1029289

Title:
  Need to authorize my google account each time I boot the computer

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