LIBYANS working under a U.N. peace process on Tuesday agreed a mechanism to choose a new temporary government to oversee the run-up to elections late this year, in the hope that it can avoid being scuppered by factional rivalries. It follows weeks of negotiation after a political dialogue in Tunis in November among 75 Libyans, selected by the U.N. Libya mission, charted a roadmap towards elections but failed to agree on how to form an interim government. Libya has known little peace since Muammar Gaddafi was overthrown in 2011, in an uprising backed by NATO, and has been split since…