Try sudo (or su: see below) apt-get install filezilla.
If that doesn't work, use these steps.
You can download the linux version of Filezilla here
. Thisi way there's no conversion problems.
If you have a 64 bit processor, go for x86_64 version, otherwise choose the other one (under linux).
Since you stated yourself as a linux Newbie, I think I should clarify how to install the source files there.
1. Make sure you have make installed.
go to terminal, and enter these.
If using root password, su
If you used su, leave out sudo for this one. sudo apt-get install make
2. Make sure you have linux headers.
sudo apt-get install linux-headers.
3. Extract the tar.gz file you download with something. I believe most installations come with one in the gui.
4. navigate to the file in the terminal and type: make install
It should go through a bunch of things and dump you in a terminal.
You now have Filezilla installed! congrats! if you can't find it, check in /programs or similar.