Super Spread Sheet S³

Or little computing tricks and hacks

When system upgrades break gem dependencies

After recently upgrading to Ubuntu 15.04 (almost ready for the next release!), my gem dependencies were broken.

... /lib/mysql2.rb:31:in `require': 
Incorrect MySQL client library version! 
This gem was compiled for 5.5.43 but the client library is 5.6.24. (RuntimeError)

Neither bundle nor bundle update changed the gem. Only uninstalling the gem forced the correct update:

gem uninstall mysql2
bundle install

Solution taken from


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