mysql error after upgrading to Lucid Lynx

After I upgraded my Ubuntu machine from Karmic Koala to Lucid Lynx and running my ror app,
I get the following mysql error:

/usr/lib/ruby/gems/1.8/gems/mysql2-0.2.4/lib/mysql2/mysql2.so: libmysqlclient.so.15: cannot open shared object file: No such file or directory - /usr/lib/ruby/gems/1.8/gems/mysql2-0.2.4/lib/mysql2/mysql2.so (LoadError)

Running this command fixes the error:

$ sudo apt-get install ruby-dev

Installing Sphinx with MySQL support in Ubuntu Karmic Koala

apt-get install gcc make libmysqlclient15-dev libmysql++-dev


curl -O http://sphinxsearch.com/downloads/sphinx-0.9.9.tar.gz


tar zxvf sphinx-0.9.9
cd sphinx-0.9.9
./configure
make
sudo make install


http://acidborg.wordpress.com/2009/11/22/how-to-install-and-configure-sphinx-in-ubuntu-9-10-with-mysql-support/

undefined method `installed_source_index' Error

When I try to update the gems specification file I get this error.

$ rake gems:refresh_specs --trace
** Invoke gems:refresh_specs (first_time)
** Execute gems:refresh_specs
rake aborted!
undefined method `installed_source_index' for #
/usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/gem_dependency.rb:217:in `refresh'
/usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/tasks/gems.rake:53
/usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/tasks/gems.rake:53:in `each'
/usr/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/tasks/gems.rake:53
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain'
/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31
/usr/bin/rake:19:in `load'
/usr/bin/rake:19

To fix:

1. Go to the gems main directory and type this command

$ gem specification > .specification