It's too bad Sequel Pro is not available to Ubuntu. I didn't think SQuirreL SQL's GUI was usable but I've had ok experiences with PhpMyAdmin.
$ sudo -i
$ apt-get phpmyadmin
$ gedit /etc/apache2/apache2.conf
# Add this at the very last line then save your changes:
> Include /etc/phpmyadmin/apache.conf
# Enable the php dependencies
$ gedit /opt/phpfarm/inst/php-[MAJOR-MINOR-PATCH]]/lib/php.ini
# Enable these extensions:
> extension="/usr/lib/php5/20121212/mysqli.so"
> extension="/usr/lib/php5/20121212/mcrypt.so"
$ service apache2 restart