The installation of the Foreman .DEB package fails on Debian Linux 5.0 (Lenny) due to an old version of rake.

The package tree for Debian Linux 5.0 contains rake 0.8.1. /usr/share/foreman/extras/dbmigrate, which is being run by the package postinst script, fails due to the old rake version:

$ su - foreman -s /bin/sh -c /usr/share/foreman/extras/dbmigrate
(in /usr/share/foreman)
rake aborted!
undefined method `reenable' for <Rake::Task db:schema:dump => [environment]>:Rake::Task

Installing a more recent version of rake through RubyGems and linking the binary to /usr/local/bin/rake fixes the problem.

Reference: HowTo update rake 0.8.1 -> 0.8.4 on debian