Whenever you try to install any packages may get an error like below,

"E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution)".

For example, If you try to install apache server,

# sudo apt-get install apache2


Reading package lists... Done

Building dependency tree       

Reading state information... Done

You might want to run 'apt-get -f install' to correct these:

The following packages have unmet dependencies:

 apache2 : Depends: apache2-bin (= 2.4.7-1ubuntu4.1) but it is not going to be installed

           Depends: apache2-data (= 2.4.7-1ubuntu4.1) but it is not going to be installed

 teamviewer9 : Depends: libc6-i386 (>= 2.4) but it is not going to be installed

               Depends: lib32asound2 but it is not installable

               Depends: lib32z1 but it is not going to be  installed

               Depends: ia32-libs but it is not installable



E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).


Solution:

Execute below commands,
 
# sudo apt-get clean

# sudo apt-get autoclean


Reading package lists... Done

Building dependency tree       

Reading state information... Done

Clear the local repository of retrieved package files like .deb and removes lock file from /var/cache/apt/archives/
 
# sudo apt-get -f install

-f specify for fix broken


Reading package lists... Done

Building dependency tree       

Reading state information... Done

Correcting dependencies... Done

Finally, you can  install easily any packages.
 
# sudo apt-get install apache2