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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 ?

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    Welcome Sivamani , in terminal run sudo apt-get update && sudo apt-get upgrade. – atenz Aug 2 '12 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 '13 at 17:45
13

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

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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.

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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

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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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