[Bug 1500378] [NEW] Usability for update error: unauthenticated sources

[Bogdan]

Public bug reported:

In order to solve the error "This requires installing packages from unauthenticated sources."
As user
I need ubuntu to show me the error cases


Given an old installed package with an key expired
When I run the Software Updater
Then I get error about "This requires installing packages from unauthenticated sources." 
And info about the cause and solution

*Right now we got only the error message with 2 options:
- OK - doesn't help (just closes the window)
- Settings... - opening Software & Update settings : doesn't help because don't know the root cause. 

* Searching in Internet leads to many results - many of them not good.

* Doing from command line (so not user friendly for the common user):
sudo apt-get update
W: GPG error: http://download.opensuse.org  Release: The following signatures were invalid: KEYEXPIRED 1437126969

So the OS knows the cause. It just have to be integrated in gui error
message (eg with Details dropbox) . Then the user will go to Settings
and fix the error.

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1500378

Title:
  Usability for update error: unauthenticated sources

Status in ubiquity package in Ubuntu:
  New

Bug description:
  In order to solve the error "This requires installing packages from unauthenticated sources."
  As user
  I need ubuntu to show me the error cases

  
  Given an old installed package with an key expired
  When I run the Software Updater
  Then I get error about "This requires installing packages from unauthenticated sources." 
  And info about the cause and solution

  *Right now we got only the error message with 2 options:
  - OK - doesn't help (just closes the window)
  - Settings... - opening Software & Update settings : doesn't help because don't know the root cause. 

  * Searching in Internet leads to many results - many of them not good.

  * Doing from command line (so not user friendly for the common user):
  sudo apt-get update
  W: GPG error: http://download.opensuse.org  Release: The following signatures were invalid: KEYEXPIRED 1437126969

  So the OS knows the cause. It just have to be integrated in gui error
  message (eg with Details dropbox) . Then the user will go to Settings
  and fix the error.

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