WINONA, Minn. – The Winona Daily News entered a nether zone after its corporate computer system fell victim to a cyberattack.  Daily online news postings were interrupted, as well as e-editions, said Kevin Mowbra, president of Lee Enterprises. Lee has operations in 77 locations, including Madison, LaCrosse and Winona.  Mowbra said the company was workimg to maintain operations under “challenging circumstances.” News reporters, for example, were still on their beats even though much of their work was dead-ending. Mowbra didn’t say whether readers would be offered subscription refunds for missed coverage.