Problems with installing and using hashcat

[Andy1975]

I'm a absolut beginner and I need help for my Itunes backup, because i didn't know my itunes backup password. All my important photos are in this backup.

I'd bought a computer Fujitsu Siemens Esprimo P7936 with a NVIDIA GeForce GT 710 - 1 GB - VGA / DVI / HDMI installed ubuntu an tried to install hashcat.

First I had some problems with signing the pgp-signature and then i tried another way, but the result is crashing.

Is there a step by step installation and cracking guide availible?

[undeath]

1. install nvidia driver using ubuntus package manager
2. download hashcat from https://hashcat.net/hashcat/
3. unpack hashcat
4. done