The ordinance shall be published once a day for at least 12 days in a newspaper published at least six days a week in the municipality or at least once a week for two weeks in a newspaper published less than six days a week in the municipality. The insertion each week for two succeeding weeks is a sufficient publication in a newspaper published less than six days a week. The first publication of the ordinance shall be at least two weeks prior to the date mentioned in the ordinance for holding the election. In municipalities where no such newspaper is published the ordinance shall be posted in three public places therein for two succeeding weeks next before the day fixed for the election.