Error when i try to install freePBX 2.2 on Ubuntu 6.10

I try to install freepbx and on the this step

[email protected]:/usr/src# svn co https://svn.sourceforge.net/svnroot/amportal/freepbx/branches/2.2 freepbx-2.2
svn: PROPFIND request failed on ‘/svnroot/amportal/freepbx/branches/2.2’
svn: PROPFIND of ‘/svnroot/amportal/freepbx/branches/2.2’: Could not resolve hostname `svn.sourceforge.net’: Host not found (https://svn.sourceforge.net)

i have error.
Can any help me??? why this server is not accesseeble??

You’ll need to change that command to

[code:1]svn co https://amportal.svn.sourceforge.net/svnroot/amportal/freepbx/branches/2.2 freepbx-2.2
[/code:1]
to allow for sourceforge’s policy of each project having its own repository