How to update to later version

Hi, I run UBUNTU 12.04LTS 64-bit. I have scrivener installed and am attempting scrivener It gives the following message:
scrivener: (Multi-Arch: no) is not co-installable with scrivener:i386 (Multi-Arch: no) which is currently installed
I’m not able to find a identified method for removing scrivener. I am an advanced user in terms of linux but this has stomped me. Can you advise me? … b-package/