The reason why you're told to update through NSU is because you don't have enough free space in your rootfs. Therefore try to uninstall some/all testing/devel applications and disable the repositories. Rebooting could also work.
Go to terminal and type in command "df -h". This shows how much rootfs free space you have.
I have 58Mb free or 74%. I was told this is enough?
Just noticed in the Mirror app before updating, that there was greenish colored hue to the right hand side of the screen, like a vertical bar that took up about 10% of the right hand side of the screen using that app. That is gone now. So it looks like some sort of update has been done to the front facing camera.
Ok so I know this is a little off topic - but I have just read 51 pages of this thread and the number of postings asking the same question over and over and over again is mind numbing. Does nobody read anymore? Even the first post?
can't update un Perú yet....