If you're using CVS to get plan9port or drawterm, it's time to switch to Mercurial. http://swtch.com/plan9port/man/man1/hg.html
More detail follows, for those who care. In November 2007 I added support for fetching Plan 9 from User Space via Mercurial instead of CVS. For the past two years I've been keeping both repositories in sync, but I am no longer able to do so--the chewing gum and duct tape holding them together has broken yet again and I am not going to bother trying to fix it. I have changed the copy of INSTALL in the CVS repository to point at the Mercurial instructions, and I will leave the CVS repository alone for at least a few months before deleting it. The drawterm situation is the same, although there the Mercurial repository is a more recent arrival. If you need to install Mercurial, I've found that "sudo easy_install mercurial" works on both Linux and OS X and installs a newer version than apt-get does on Ubuntu. Sorry for the inconvenience. Russ P.S. If you are already using Mercurial for plan9port, please check your $PLAN9/.hg/hgrc file and make sure the "default =" line reads default = http://code.swtch.com/plan9port/ If you were an early Mercurial adopter, you might instead have a line like default = http://hg.pdos.csail.mit.edu/hg/plan9/ # NOT THIS If so, edit the file to make it use the first URL.