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I'm trying to set up a Rails 2.2.2 installation (for an old app that I maintain) in a new Linux Mint 18 install.

I've installed mysql (5.7.16-0ubuntu0.16.04.1 (Ubuntu)) and, using RVM, have installed the same mysql gems that I have in my old Linux Mint 13 install (which i still have up and running on a seperate partition on the same computer).

The gems are:

mysql (2.7)
mysqlplus (0.1.2)

When I try to start rails I get this error:

irb: symbol lookup error: 
/home/max/.rvm/gems/ruby-1.8.6-p420@elearning-resource/gems/mysqlplus-0.1.2/lib/mysql.so: 
undefined symbol: vio_blocking

I don't know what mysql.so is: it's a binary of some sort.

I've never seen this error before - can anyone help?

thanks, Max

  • mysql.so is a 'shared object', i.e. sort of function library. It seems that your version of RoR needs a different (newer?) version of mysql.so, having the symbol vio_blockingdefined. – ridgy Jan 27 '17 at 14:02
  • Thanks. I removed mysql and installed an earlier version (5.6.16) instead and that fixed it. I think that my version of the rails mysql gem may be too old for the latest mysql. – Max Williams Jan 27 '17 at 16:22

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