Bo Östen Undén ( Karlstad 25 August 1886 -- Stockholm 14 January 1974 ) , J.D. , was a Swedish academic , civil servant and Social Democratic politician and acting Prime Minister of Sweden 6 October 1946 -- 11 October 1946 following the death of Per Albin Hansson .
Bo Östen Undén , born 25 August 1886 in Karlstad , Sweden , dead 14 January 1974 in Stockholm , Sweden , JD , was a Swedish academic , civil servant and Social Democratic politician . He was acting Prime Minister of Sweden 6 October 1946 -- 11 October 1946 following the death of Per Albin Hansson .