OpenACS and .LRN packages have been accepted into Debian, and are available on Unstable (Sid) and Testing (Squeeze) repositories:

• OpenACS: http://packages.qa.debian.org/o/openacs.html
• .LRN: http://packages.qa.debian.org/d/dotlrn.html

The packages have also been imported into Ubuntu (Lucid Lynx), and are available to download:

• OpenACS: http://packages.ubuntu.com/lucid/openacs
• .LRN: http://packages.ubuntu.com/lucid/dotlrn

More info:

• Debian packages
• Ubuntu packages