Greece starts drive to sell new debt deal to doubting Europe

* Finance minister says Greece needs to go "cold turkey" on debt

* PM Tsipras trying to buy time to negotiate new debt deal

* Collective wage bargaining, minimum wage hike planned (Releads after finance ministers meet, adds quotes, details)

By Ingrid Melander and Angeliki Koutantou

PARIS/ATHENS, Feb 1 (Reuters) - Greece's leftist government began its drive to persuade a sceptical Europe to accept a new debt agreement on Sunday while it starts to roll back on austerity measures imposed under its existing bailout agreement.

After a turbulent first week in office, the new government has made clear it wants to end the existing arrangement with the European Union, the European Central Bank and International Monetary Fund "troika" when its aid deadline expires on Feb. 28.

Instead, Prime Minister Alexis Tsipras wants to agree a bridging deal with the troika to gain breathing space while a new deal is negotiated to reduce Greece's unmanageable public debt burden of more than 175 percent of its economic output, or 320 billion euros ($360 billion).

"For the last five years, Greece has been living for the next loan tranche. We have resembled drug addicts craving the next dose," Finance Minister Yanis Varoufakis said after meeting his French counterpart Michel Sapin in Paris.

"What this government is all about is ending the addiction," he said, noting that it was time to go "cold turkey".

He said Greece needed a short space of time to present its reform proposals and expected to be able to hammer out a new agreement with its partners within about six weeks. He said he wanted to deal directly with European partners, the ECB and IMF rather than go through inspectors from the troika.

Varoufakis goes to London to see British Finance Minister George Osborne on Monday and travels to Rome on Tuesday. A meeting with German Finance Minister Wolfgang Schaeuble, who has repeatedly demanded that Greece meet all its bailout obligations, would follow in the coming days, he said.

Sapin repeated that Greece could not expect its partners to accept a straight debt write off. But he left the door open to other options that could include giving Athens more time for repayment.

"Anything that can alleviate the Greek debt burden will be welcome ... but of course there is no question of cancelling the Greek debt," he said.

Tsipras himself is due this week in Rome and Paris, the two major capitals where his hopes for a sympathetic hearing are highest, given French and Italian calls for an easing in rigid euro zone budget austerity.

He is also due to meet European Commission President Jean-Claude Juncker and Deputy Prime Minister Yannis Dragasakis said that meeting could be crucial to laying the basis for a deal.