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Posted via http://www.ruby-forum.com/.
I had the same problem, but with actionpack-2.1.0.gem. The way I solved
it was by deleting actionpack, and then updating gems:
cd /usr/lib/ruby/gems/1.8/cache/
rm actionpack-2.1.0.gem
cd /usr/local/rubygems-0.9.5/
gem update –system
gem install rails --include-dependencies
Thanks.
--Willie
sudo apt-get remove ruby1.8
sudo apt-get remove ruby1.8-dev
sudo apt-get remove rubygems1.8
sudo apt-get install ruby1.9.2
sudo apt-get install ruby1.9.2-dev
sudo apt-get install rubygems1.9.2
and everything's ok