Canonical actually put a lot of work in making last few Ubuntu releases faster and more stable. Even the infamous Unity desktop has improved a lot in the last few releases, consuming much less memory, quicker to use and more stable. I have been using Ubuntu 14.04 LTS as my lone OS for a month now, at home and at office. I have tested Ubuntu 14.04 LTS rigorously for over a month and based on that I have written a review on the Ubuntu 14.04 LTS release.