I have upgraded to 14.04, installing it side by side with my Ubuntu 12.04. I have Windows8 as well. So now I have three - OS to boot from my laptop. (500 GB for Win8, 250 GB for 12.04 and ~ 200 GB for 14.04)
I do not know why I chose that in the first go, but now I want to revert back and combine the two Ubuntu's into one, using only 14.04. I had the option of doing a fresh install (I couldn't go for upgrade, idk why. I was using USB to install) but installing it side by side seemed a better idea then.
However, now I realize the horror I've done. My files are a big mess and will get messier. I have no clue what is where and its an unorganized chaos.
Is there a way to combine 14.04 and 12.04? Do I have to delete both of them and do a fresh install? How to do that?