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.
Try to update (apt-get update) from terminal, see what's failing, and then use the software sources to disable whatever is failing.
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..