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I am using Ubuntu 12.10. When I try to update the software, it shows me this error:

Requires installation of untrusted packages
This requires installing packages from unauthenticated sources.
Details 
kalzium-data kanagram kate-data kde-l10n-engb kde-l10n-zhcn kde-runtime-data kdegames-data klettres-data libakonadi-kabc4 liblxc0 libwildmidi-config libwildmidi1 lxc marble-data nepomuk-core-data parley-data tomboy
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2 Answers 2

You can't install untrusted packages using Update Manager.

Open your terminal and type

sudo apt-get update

You will be prompted for your password. Enter it.

Now enter the following command.

sudo apt-get upgrade

Now it will ask you if you want to download X Mb of packages. Give yes.
Now it will list all untrusted packages and will ask you if you want to install. Again give yes.

Now, all your required packages should get installed.

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What to do to avoid installing from those untrusted sources and only install from the trusted ones? –  spartacus Nov 13 '13 at 6:16
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You can either do sudo apt-get update && sudo apt-get upgrade from terminal and then update from the Update Manager.

OR

Add the untrusted package and do from UI. sudo apt-add-repository "package name".

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