rake command in virtual rails

i have virtual rails running on linux mint installed on laptop...im
trying to run a rake command but keep getting the following errors:

virtualrails@jay ~/blog $ rake db:migrate
(in /home/virtualrails/blog)
rake aborted!
no such file to load -- sqlite3

(See full trace by running task with --trace)

virtualrails@jay ~/blog $ rake db:create
(in /home/virtualrails/blog)
rake aborted!
no such file to load -- sqlite3

what am I doing wrong?

You have failed to install a required dependency.

gem install sqlite3-ruby