Ok, I think I found the missing dependency. I just apt-get'ed ri and rdoc and am now getting the correct answer:
irb(main):001:0> help => nil help File for example gives me the help for the class File. To make this work I installed these version: ri 1.8.2-1 rdoc1.8 1.8.4-1ubuntu1.1 ri1.8 1.8.4-1ubuntu1.1 -- Dependency-problem in IRC (help missing) https://launchpad.net/bugs/56074 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
