Wine installations stalls about half way

I've tried to install this 3 or 4 times, but each time the progress bar stops about half way. Here's the current screenshot:

I'm unable to cancel or close. It's been like this for a few hours now.

Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty

I'm not hugely technical so am hoping I don't have to spend much time on this - I was hoping for an almost "out-of-the-box" OS.

Thanks for any help.