appears to be part of a Subversion 1.7 or greater working copy [ubuntu에서 svn checkout이 안 될 때)

http://askubuntu.com/questions/65468/where-can-i-find-a-subversion-1-7-binary

As of Ubuntu 12.10, subversion 1.7 is available as part of the distribution. Subversion can be installed using apt-get.

sudo apt-get subversion

For earlier version of Ubuntu, there is a ppa available at subversion-1.7. The repository can be added as follows:

sudo apt-add-repository ppa:dominik-stadler/subversion-1.7

To get the latest version of subversion update and upgrade the repository.

sudo apt-get update
sudo apt-get upgrade

I needed to also do a dist-upgrade.

sudo apt-get dist-upgrade

I'm assuming that you already have subversion installed, if not:

sudo apt-get install subversion