Just thought I would add to the problem. If you try to drop the quest and pick it back up at K7 station, the quest is no longer available at any of the NPC's. Seems like a major bug to me. There was a thread already in the bug report section of the forums but no response from any devs or mods.
The shame of it is that the Borg Hunt mission is a blast. TONS of Borg running around mauling starships. Heck, I got smushed between SIX of the cubes. When you move as a fleet it's not bad at all but as soon as the splits start happening....it gets crazy.
Glad to hear it's bugged. I tried this once, got no credit and left.
You can actually come close to soloing this. There is usually an alley through the spheres and cubes to get to the hubs. Sometimes it's from above, sometimes it's below. Some of the repair hubs are impossible to get to but you only need 4. I destroyed 2 by myself.