Great advice as usual, but I'd point out that the last line is the most important one. No two workplaces are the same, and opinions rarely fit neatly in to buck

Great advice as usual, but I'd point out that the last line is the most important one. No two workplaces are the same, and opinions rarely fit neatly in to bucketed categories like "can use Linux" and "can't use Linux". There's always some subtlety that blurs the lines. The best thing to do is to talk to potential employers. Be sure to make an honest effort to understand why they have the policies that they do, and remember that you don't have an experience managing n employees, so you may not be familiar with the challenges inherent to an environment where managers are outnumbered by 10:1. Every moment you spend understanding their viewpoint will allow you to better articulate how your desire to use Linux fits in to their model.