Born in Black Lake, Quebec, Loubier studied law at Laval University, and was admitted to the bar in 1958.

Following the defeat of the Bertrand government in the 1970 provincial election, Loubier was a candidate in the June 1971 Union Nationale leadership convention defeating Marcel Masse on the third ballot to become party leader and leader of the Opposition.

From October 25, 1971, to January 14, 1973, the Union Nationale temporarily changed its name to Unité Québec.

In the 1973 election, the Union Nationale was wiped off the electoral map, winning no seats, and Loubier ceased to be leader of the Opposition.

This article about a Member of the National Assembly of Quebec from the Union Nationale is a stub.