For everyday use, I try to install skype linux version 4.3.

First download the .deb file from the website of skype.

Then dpkg -i skype.deb.

If dependency is not satisfied, then try to install each required dependency all together(not each for one time).

If they can‘t be successfully installed, try apt-get -f install to update the dependency.  

That‘s it. Then you can start enjoy the linux skype.....

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ubuntu 14.04 install linux skpye4.3