From: Romulo Ceccon Date: 2008-01-12T21:29:03+09:00 Subject: Re: Problem with installing gems via rubygems. Hi. dizz wrote: > Hey I am having a problem installing rails on my ubuntu machine. I > cannot install any gems and keep on getting the following error. > > ERROR: Error installing rails: > invalid gem format for /usr/lib/ruby/gems/1.8/cache/ > activerecord-2.0.2.gem > > I have tried updating rubygems, manually installing rubygems (not > using synaptic) and still cannot get ruby gems to work. > > It would be great if anybody could give me a hand. Since one of the latest Rails versions I have had the same problem on my Windows box (actually that happens only when trying to install a second rails version on the same machine). I do the following to workaround it: 1. Manually download the Rails gem at https://rubyforge.org/frs/?group_id=307 2. Unpack it with `gem unpack rails-X.X.X.gem` 3. Search the Rakefile file inside the unpacked dir for lines that start with s.add_dependency 4. Manually download all the dependencies at rubyforge (each one has its own project) 5. Install each one with `gem install xxx.gem`. For Rails 2.0.1 the appropriate order is: activesupport, actionpack, actionmailer, activerecord, actionresource, rake, rails. And whenever you have an issue with gem, trying updating it first: `gem update --system`. That usually solves many problems. Regards, Romulo A. Ceccon -- Posted via http://www.ruby-forum.com/.