According to union officials and the Greek government, the country may sell 51% stake in Hellen Petroleum, it’s biggest oil refiner, in order to meet a condition necessary to secure it’s next EU bailout. Athens agreed to launch a series of privatizations as a stipulation for the 86 billion euro bailout that they are set to receive. The country has been sustaining itself on EU bailouts since it’s economic collapse in 2011, and stability would be severely undermined if they fail to secure the next sum.
See "Greece could sell 51 percent stake in Hellenic Petroleum: sources", Angeliki Koutantou, Reuters, March 7, 2018