UN-backed government leader Dbeibah added that he agrees all the government institutions should leave and supports protesters in the country.
The talks come after clashes broke out in Tripoli between rival groups, raising fears of escalating violence in the conflict-hit country.
Second Berlin Conference on Libya was aimed to make progress on removing mercenaries and other foreign forces, months after the ceasefire called for their withdrawal, as well as on steps towards securing a December 24 election.
Participants in talks in Switzerland will vote next week to pick a three-person presidential council and a prime minister to oversee preparations for this year's national election.
Russian FM Lavrov says Fayez al Sarraj and Khaled al Mechri "have just signed" the ceasefire agreement, while Khalifa Haftar and Aguila Saleh "have asked for a bit more time until morning to make a decision on its signing."
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