Ubuntu has adopted a not-widely-used colour (probably there are reasons for /that/) and sticks to it consistently (to the dismay of many :). As an effect, many

Ubuntu has adopted a not-widely-used colour (probably there are reasons for /that/) and sticks to it consistently (to the dismay of many :). As an effect, many people (who have seen Ubuntu) now associate orange/brown with it. It's simple brand recognition. (Personally I don't like their choice, but in a world saturated with bluish/lightgrayish/greenish/sunny spring morning colours, it's a brown cow)