Quinn resigned in October 2004, with Shrewsbury finding life hard back in the Football League. He returned briefly to Peterborough as assistant manager, and then became manager of Norwegian Division Three club Egersunds in December 2005. Despite a very successful spell, Quinn resigned after just five months, citing personal reasons. On 15 September 2006 Quinn was appointed manager of Conference National strugglers Cambridge United, signing a two-year contract, with his former Peterborough teammate Steve Castle as his assistant. United chairman Lee Power claimed that Quinn "filled all our criteria" for the job.