Working from a clean install of Ubuntu 10.04 64:
Testing your guide

The line:
sudo apt-get install build-essential libgtk2.0-dev libssl-dev libdb4.7-dev libdb4.7++-dev libboost-all-dev checkinstall svn git
Returns the error:
E: Couldn't find package svn
Oops, I forgot that the package is actually named subversion. I'll update the post now.