升级到ubuntu 12.04后无法在rails中运行我的服务器

Question

I just upgraded ubuntu from 11.10 to 12.04 and after that when I run my server inside my rails project I got this error

$ rails s
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/mysql2-0.3.11/lib/mysql2.rb:9:in `require': 
libmysqlclient_r.so.16: cannot open shared object file: No such file or directory - 
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/mysql2-0.3.11/lib/mysql2/mysql2.so (LoadError)

any help please?

Answer 1

Go to your project and follow the steps,

rvm gemset empty <gemset name>
gem install bundler
bundle install

It will solve your problem.

If that does not work, or if you are not using rvm, please use

gem uninstall mysql2
bundle install

from one of your mysql2-using Rails project's directory.

Answer 2

I followed Babak's instruction that he posted and it worked after a small change.

My system is Ubuntu 12.04 server and it has Ruby1.9.3 installed so I did this

sudo apt-get install mysql-server libmysqlclient-dev

Seems like the libmysqlclient16-dev is now renamed to libmysqlclient-dev in Ubuntu 12.04

Afterwards I ran

gem install mysql2

Answer 3

Well, I would suggest double checking the ruby and the rails version and make sure they are the same ones u created your project with. Maybe you have to change the version using rvm:

• rvm use 'Version'

Maybe you can uninstall and reinstall the mysql packages again, also try installing:

• sudo apt-get install mysql-client mysql-server libmysqlclient16-dev

or

• sudo apt-get install mysql-client mysql-server libmysqlclient-dev

Also try uninstalling and reinstalling your mysql gem. This blog post had a solution for this error as well, although the error was cause at a different time.

Answer 4

For me nothing up there work. Then I found this and try to delete and create again the database.yml file. AND IT WORKS!