install driver for Lexmark printer

I downloaded the unbuntu driver for my x7675 Lexmark printer but can't install because it ask for root password.

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Open a Terminal and issue the

Open a Terminal and issue the command: gksudo gdebi-gtk
A box will open.
Put in your usual sudo password.
Gdebi will open.
Go File>Open (Navigate to the decompressed file)
Click Open