Im very unfamiliar with ubuntuI and linux in general. I'm trying to set up a laptop that was given to me (Asus UL50VT). Everything seemed smooth and i even seem to have gotten the Nvidia and Intel graphics drivers working. I somehow screwed up my repository sources. I now have red filled in circle with a while minus symbol in the upper right corner. When i hover over it it says "a problem occurred when checking for the updates"
I want to make this work please help.
EDIT: i think it has something to do with me checking all these boxes.