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I tried to install Skype on Ubuntu 10.04 and I received the following error:

Requires installation of untrusted packages 
The action would require the installation of packages from not authenticated sources.
Details : 
gcc-4.6-base:i386 libaudio2:i386 libavahi-client3:i386 libavahi-common-data:i386 libavahi-common3:i386 libcomerr2:i386 libffi6:i386 libgcc1:i386 libgpg-error0:i386 libgstreamer0.10-0:i386 libice6:i386 libjpeg8:i386 libkeyutils1:i386 liblcms1:i386 libmng1:i386 liborc-0.4-0:i386 libp11-kit0:i386 libpcre3:i386 libpng12-0:i386 libqtwebkit4:i386 libselinux1:i386 libsm6:i386 libstdc++6:i386 libuuid1:i386 libx11-6:i386 libxau6:i386 libxdmcp6:i386 libxext6:i386 libxi6:i386 libxrender1:i386 libxss1:i386 libxt6:i386 libxv1:i386 zlib1g:i386

How can I fix it?

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I hope this will lead you further click here for detailed information

Mind you: I've never tested this solution, since I don't use Skype. But it should work according to the Wiki

Succes !

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To install skype from trusted place:

If you are using 64 bit, you have to enable multiarch

sudo dpkg --add-architecture i386

Add the repo of skype

sudo add-apt-repository "deb $(lsb_release -sc) partner"

Update your sources list

sudo apt-get update  

Now install skype from command line

sudo apt-get install skype

Now, To install untrusted packages you can do it from command line not from GUI like Ubuntu Software Center.

You'll be prompted whether you wanna install from untrusted choose yes

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