DULUTH, MN (KDAL) - The St. Louis County Public Health Department is offering free flu shots for uninsured or underinsured residents this week and again on December 20th.  The flu vaccinations will be provided at "Ruby's Pantry" sites starting on Tuesday at the Peace In Christ Lutheran Church in Hermantown from 4:30 to 6:30 p-m.  Flu shots will also be offered at the St. Margaret Mary Catholic Church in Morgan Park from 3:30 to 5:30 Tuesday.  Other locations include the Arrowhead Town Hall in Brookston on Thursday from 7:30 to 11 a-m and at the Copper Top Church in Duluth on December 20th from 4:30 to 6:30 p-m.  Contact the St. Louis County Public Health Office at 725-5210 for more information.