Drush unable to bootstrap to database
OK I've got drush working:) For other people who might have a similar problem (hope I use the right terms):

I had to install "php5-mysql" (and dependencies) in Linux (for example through "synaptic package manager"), php5-mysql is a MYSQL module for PHP5 which contains mysql PDO support. With this I was able to enable modules and use the omega commands. Drush uses the PHP installed in Linux and not in Xammp, I had this module in Xampp but not in Linux.

You can see which php.ini file drush uses by typing "drush status" in your terminal.

You can see which php.ini file is used by your web server by navigating to admin/reports/status of your drupal site. Next click the "more information" link on Drupal's status page's PHP section. This shows the phpinfo() page. Locate the Configuration File (php.ini).

To check that the mysql PDO support is installed (part of "php5-mysql"), type the following in a terminal: 
php -i|grep PDO
If support is installed you should see something like this:
PDO
PDO support => enabled
PDO drivers => mysql
PDO Driver for MySQL => enabled