After the software updater pops up with some downloads as usual , I tried to download but after authentication a message says " Requires installation of untrusted packages This requires installing packages from unauthenticated sources" and when I hit the O.K button it does not update. Again the next day same thing happens ,the software updater pops up. I could not update. How do I fix this issue? The screen shot is below. I am using Ubuntu 14.04. Thanks.
My 14.04 just got that same issue. It's unbelievable they cannot fix that!
Solution is to open terminal and run:
sudo apt-get update sudo apt-get upgrade
I wonder how average users and moms will handle this. I also wonder what excuse prevents the software updater from running those same commands..