I am completely new to Ubuntu and this forum. I've just gone through the process for a free download of Desktop LTS, for the purpose of establishing a MythTV set-up on my home. 
The MythTV instructions suggested using a 64 bit version of Ubuntu, but during the free download steps, I did not see any option to select this, except in the "other options" category under bit torrent, which seemed to require a fee.
Can anyone explain how I tell which version I have downloaded, or how I can make certain I get the 64 bit? Please excuse me if these are elementary questions...I'm really feeling my way here.
Thanks,
Peter