He is a notable advocate of centre-right fiscal politics and federalism in Quebec.
He earned a French baccalaureat at Collège Stanislas, an elite Roman Catholic private school.
From 1985 to 1988, he also hosted the weekly television show Questions d'argent on Radio-Québec (now Télé-Québec) on economics and personal finances.
Dubuc was appointed chief editorialist of La Presse in 1988, a position he held until 2001, when he was succeeded by André Pratte.
In 2001, he was appointed president and editor of Le Soleil, a position he held until 2004.