I downloaded Skype for Ubuntu from here. I tried to install it with the command sudo dpkg -i skype-ubuntu-precise_4.2.0.11-1_i386.deb but the installation failed. The following lines were displayed in the terminal:

dineshkumar@dineshkumar-desktop:~/Downloads$ sudo dpkg -i skype-ubuntu-precise_4.2.0.11-1_i386.deb

Selecting previously unselected package skype.

(Reading database ... 169017 files and directories currently installed.)

Unpacking skype (from skype-ubuntu-precise_4.2.0.11-1_i386.deb) ...

dpkg: dependency problems prevent configuration of skype:

 skype depends on libqtwebkit4 (>= 2.2~2011week36); however:

  Package libqtwebkit4 is not installed.

 skype depends on libxss1; however:

  Package libxss1 is not installed.

dpkg: error processing skype (--install):

 dependency problems - leaving unconfigured

Processing triggers for hicolor-icon-theme ...

Processing triggers for desktop-file-utils ...

Processing triggers for bamfdaemon ...

Rebuilding /usr/share/applications/bamf.index...

Processing triggers for gnome-menus ...

Errors were encountered while processing:

 skype

Why did the installation fail and how could I install Skype from the .deb file that I have?

I checked the question here but found it of no use. The problem being discussed there was about Skype malfunctioning after an update. But in my case, I couldn't even install Skype properly.