Subversion 1.7 on Ubuntu 12.04

there’s an official Subversion PPA on Launchpad, so for Ubuntu 12.04 all you have to do is add the following couple lines to your /etc/apt/sources.list file:

deb http://ppa.launchpad.net/svn/ppa/ubuntu precise main 
deb-src http://ppa.launchpad.net/svn/ppa/ubuntu precise main 

 To configure APT to trust this repository's signing key, run script from the page
https://launchpad.net/~svn/+archive/ubuntu/ppa

And upgrade Subversion to its latest version with apt-get:

sudo apt-get update
sudo apt-get install subversion

Source: https://kovshenin.com/2013/subversion-1-7-on-ubuntu-12-04/