Why Do I Need KDE for Okular PDF Reader??

KDE is a window manager (like GNOME).

Actually you don't need to install all kde in order to run okular, you just need the libraries.

Try this:

open a Terminal Applications->Accessories->Terminal

type:
sudo apt-get install okular-kde4

and enter

Then all the software that you need to install okular will be installed.

Just completing the awnser:

You don't need to install okular to open pdfs, if you are using Ubuntu you can open pdfs with evince.

Installing okular will not mess up your desktop.

rafael, i need okular because it's got editing tools where i can highlight and underline text in pdfs that pdf readers preloaded in ubuntu lack.

Have you tried this?

open a Terminal Applications->Accessories->Terminal

type:
sudo apt-get install okular-kde4

Rafael, it's much better if you provide an apturl, like apt://okular-kde4 or tell them to use Synaptic. Asking new users to just copy and paste sudo-commands into their terminal is not a good idea. It gives people the impression that Ubuntu cannot be used without entering alot of cryptic commands, which isn't true. Once people get used to the idea of just copying and pasting sudo-commands like that, Ubuntu will be prone to the same security issues that has caused mIRC to be such a powerful trojan horse platform.

Sorry for the off-topic message, taurus... :)

Jo-Erlend Schinstad thanks for the tip, you are totally right about this :)

taurus, you could try this:

System->Administration->Synaptic Package Manager

Type you password the synaptic will open.

Go to search and type okular.

mark okular-kde4 and click on the Apply button.

I hope this help :)