Ghoul Problem

Ghoul Problem at (location) is a Minutemen radiant quest in Fallout 4. This quest can be started randomly when speaking to Preston Garvey, listening to Radio Freedom, or talking to a settler. If a settlement hasn't been unlocked yet, this quest may be started by speaking to a settler at that location, such as Blake Abernathy at Abernathy farm, and it will unlock the settlement.

Failure to kill the targeted ghoul in a timely manner will result in the failure of the quest.

Detailed walkthrough

 * 1) Listen to the radio, talk with settlers or talk to Preston Garvey to get the quest.
 * 2) Speak to your contact in the settlement.
 * 3) Clear the ghouls from a random location. The Sole Survivor only needs to clear the targeted ghoul, usually a glowing one, to complete this objective
 * 4) Return to the contact in the settlement and inform them of your success.
 * 5) (Optional) If quest started with Preston or Radio Freedom, return to Preston Garvey. If one decides to skip this step, the experience points will not be earned right away but a couple days later, when the quest is supposed to expire.

Possible settlements asking for help

 * Abernathy farm
 * Covenant
 * County Crossing
 * Greentop Nursery
 * Nordhagen Beach
 * Oberland station
 * Sanctuary Hills
 * Starlight Drive In
 * Tenpines Bluff
 * Outpost Zimonja

Possible ghoul-infested locations

 * Bedford Station
 * Mass Pike Tunnel East
 * National Guard training yard
 * Poseidon Reservoir
 * Super-Duper Mart
 * Wicked Shipping Fleet Lockup