For those who have tried almost everything to fix this glitch, I believe i have found another option that always worked for me. Before finding a fix I had tried almost everything listed in this site, and several others. What I finally ended up doing was I traveled to the forts that the quests would've sent me to do anyways, and I cleared out the entire area. All the bandits both inside and outside of the fort were killed WITHOUT any commands, I found using any commands would cause this not to work. After clearing out the specific fort that the quest would've sent you to anyways, I simply quick traveled to the camp where legate Rikke is, and the dialogue would always be there. I've also seen a lot of talk that simply waiting, or doing other quests will fix this, my theory on that is every 10 days the forts resets, as stated by the skyrim wiki, and when this happens they reset with stormcloak NPCs instead of bandits, allowing the quest to move forward. I did not try waiting 10 days in game to test this, but killing all NPCs in the specific forts always worked with me. Hopefully this also works for others.
