This Associated Press story explains that the Minnesota Green, Libertarian, and Independence Parties coordinated with each other, so that they would not run against each other for any statewide office. This was done to enhance the chances that any of them might receive 5% for a statewide race. Getting 5% in any statewide race would make them qualified. Minnesota is one of only 8 states with no qualified parties other than the Democratic and Republican Parties.
The story does not mention that the Legal Marijuana Now Party, and the Grassroots-Legalize Cannabis Party, did not participate in dividing up the statewide races. The Legal Marijuana Now Party is on for U.S. Senate and Auditor, and the Grassroots-Legalize Cannabis Party is on for Governor and Attorney General.