http://chronicle.com/img/photos/biz/Ticker%20revised%20round%2045.gifBy . Blackboard, the giant provider of learning-management software, is for sale. According to the Reuters news agency, the privately held software company is seeking a buyer unfazed by an estimated $3-billion price tag. The company has hired two banks to conduct an auction to find such a buyer. Blackboard was taken private in a buyout four years ago. Since then, it has faced increased competition from educational-technology start-ups. More...