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. This 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 ghoul-infested locations

 * Bedford Station
 * Fiddler's Green Trailer Estates
 * Mass Pike Tunnel East
 * National Guard training yard
 * Poseidon Reservoir
 * Super-Duper Mart
 * Wicked Shipping Fleet Lockup
 * Suffolk County charter school

Bugs

 * If the player character is sent to kill the feral ghouls at Fiddler's Green, a quest marker may not appear. Killing all feral ghouls at that location may not result in the completion of the quest.