My update manager shows updates available. When I click on install updates it shows the following and does not update.

The action would require the installation of packages from not authenticated sources.

in details:

accountsservice cups cups-bsd cups-client cups-common cups-ppdc empathy empathy-common libaccountsservice0 libcups2 libcupscgi1 libcupsdriver1 libcupsimage2 libcupsmime1 libcupsppdc1 nautilus-sendto-empathy scribus-trunk

How to get updates ?

  • 1
    Welcome Sivamani , in terminal run sudo apt-get update && sudo apt-get upgrade.
    – atenz
    Aug 2, 2012 at 11:29
  • @tijybba The same can be accomplished just by pressing "Check for updates" in the Update manager and then applying it. It also refreshes all package lists.
    – gertvdijk
    Feb 1, 2013 at 17:45

4 Answers 4


To update from unauthenticated sources, use this command :

sudo apt-get update && sudo apt-get upgrade --allow-unauthenticated

See the Ubuntu manual page for apt-get to get more details about --allow-unauthenticated option


You can un-check updates in Update Manager use this to find which update is causing the problem and then re-install the PPA it comes from.

Also try sudo apt-get update in a Terminal to update your software sources.


Do the following 2 steps and check

  1. sudo apt-get update && sudo apt-get upgrade --allow-unauthenticated

  2. Go to Update Manager --> click on settings --> select Ubuntu Software tab --> You can see an option "Download From" put the main server as the download location

Save it and run it, will works


If your list of updates is not too long and you want to upgrade just a specific item. You can also:

  • Leave you update manager window open and go to synaptic,
  • type in the name of the update needed from the update manager.
  • If your update doesn't appear, remember to sort the search results by clicking the ''installed version'' column header so that they appear at the top.
  • Click on the relevant items with the grey exclamation mark then right click and click mark for upgrade, then apply.
  • A warning will come that the packages are unauthenticated. Click the button to continue the install and your update will be installed.

Hope that helps someone!

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