4 Min Read RIO DE JANEIRO (Reuters) -Shareholders in Brazil’s Petrobras voted on Monday to remove Roberto Castello Branco as CEO, and elected his government-picked successor to the board of directors, but discontent among some investors threatens to drag out the transition process. FILE PHOTO: Roberto Castello Branco, chief executive of Petroleo Brasileiro SA, attends a news conference in Rio de Janeiro, Brazil February 28, 2019. REUTERS/Sergio Moraes/File Photo The dismissal of Castello Branco, while widely expected, is an important step in the government’s plan to place Joaquim Silva e Luna, a retired army general who has no oil and gas experience, in charge of the state-controlled oil producer.