gem install error

gistfile1.sh-session

ubuntu@ip-10-13-187-68:~$ sudo gem install mosql
ERROR:  Could not find a valid gem 'mosql' (>= 0) in any repository
ERROR:  Possible alternatives: mosql
ubuntu@ip-10-13-187-68:~$ sudo gem update
Updating installed gems
Nothing to update
ubuntu@ip-10-13-187-68:~$ sudo gem install mosql
ERROR:  Could not find a valid gem 'mosql' (>= 0) in any repository
ERROR:  Possible alternatives: mosql
ubuntu@ip-10-13-187-68:~$ gem help
RubyGems is a sophisticated package manager for Ruby.  This is a
basic help message containing pointers to more information.

  Usage:
    gem -h/--help
    gem -v/--version
    gem command [arguments...] [options...]

  Examples:
    gem install rake
    gem list --local
    gem build package.gemspec
    gem help install

  Further help:
    gem help commands            list all 'gem' commands
    gem help examples            show some examples of usage
    gem help platforms           show information about platforms
    gem help <COMMAND>           show help on COMMAND
                                   (e.g. 'gem help install')
    gem server                   present a web page at
                                 http://localhost:8808/
                                 with info about installed gems
  Further information:
    http://rubygems.rubyforge.org
ubuntu@ip-10-13-187-68:~$ gem help commands
GEM commands are:

    build             Build a gem from a gemspec
    cert              Manage RubyGems certificates and signing settings
    check             Check installed gems
    cleanup           Clean up old versions of installed gems in the local
                      repository
    contents          Display the contents of the installed gems
    dependency        Show the dependencies of an installed gem
    environment       Display information about the RubyGems environment
    fetch             Download a gem and place it in the current directory
    generate_index    Generates the index files for a gem server directory
    help              Provide help on the 'gem' command
    install           Install a gem into the local repository
    list              Display gems whose name starts with STRING
    lock              Generate a lockdown list of gems
    outdated          Display all gems that need updates
    owner             Manage gem owners on RubyGems.org.
    pristine          Restores installed gems to pristine condition from files
                      located in the gem cache
    push              Push a gem up to RubyGems.org
    query             Query gem information in local or remote repositories
    rdoc              Generates RDoc for pre-installed gems
    search            Display all gems whose name contains STRING
    server            Documentation and gem repository HTTP server
    sources           Manage the sources and cache file RubyGems uses to search
                      for gems
    specification     Display gem specification (in yaml)
    stale             List gems along with access times
    uninstall         Uninstall gems from the local repository
    unpack            Unpack an installed gem to the current directory
    update            Update the named gems (or all installed gems) in the local
                      repository
    which             Find the location of a library file you can require

For help on a particular command, use 'gem help COMMAND'.

Commands may be abbreviated, so long as they are unambiguous.
e.g. 'gem i rake' is short for 'gem install rake'.
ubuntu@ip-10-13-187-68:~$ sudo gem install mosql
Fetching: sequel-4.16.0.gem (100%)
Fetching: pg-0.17.1.gem (100%)
Building native extensions.  This could take a while...
Fetching: bson-1.11.1.gem (100%)
Fetching: mongo-1.11.1.gem (100%)
Fetching: bson_ext-1.11.1.gem (100%)
Building native extensions.  This could take a while...
Fetching: rake-10.3.2.gem (100%)
Fetching: log4r-1.1.10.gem (100%)
Fetching: json-1.8.1.gem (100%)
Building native extensions.  This could take a while...
Fetching: mongoriver-0.4.0.gem (100%)
Fetching: mosql-0.4.1.gem (100%)
Successfully installed sequel-4.16.0
Successfully installed pg-0.17.1
Successfully installed bson-1.11.1
Successfully installed mongo-1.11.1
Successfully installed bson_ext-1.11.1
Successfully installed rake-10.3.2
Successfully installed log4r-1.1.10
Successfully installed json-1.8.1
Successfully installed mongoriver-0.4.0
Successfully installed mosql-0.4.1
10 gems installed
Installing ri documentation for sequel-4.16.0...