Running apt-get and you get an error

sudo apt-get -y dist-upgrade

You might want to run ‘apt-get -f install’ to correct these.

The following packages have unmet dependencies:

libgnutls-openssl27 : Depends: libgnutls-deb0-28 (= 3.3.8-6+deb8u4) but 3.3.8-6+deb8u3 is installed

libhogweed2 : Breaks: libgnutls-deb0-28 (< 3.3.8-6+deb8u4) but 3.3.8-6+deb8u3 is installed

E: Unmet dependencies. Try using -f.

cat /etc/apt/sources.list /etc/apt/sources.list.d/*

deb http://mirrordirector.raspbian.org/raspbian/ jessie main contrib non-free rpi

# Uncomment line below then ‘apt-get update’ to enable ‘apt-get source’

#deb-src http://archive.raspbian.org/raspbian/ jessie main contrib non-free rpi

deb http://archive.raspberrypi.org/debian/ jessie main ui

# Uncomment line below then ‘apt-get update’ to enable ‘apt-get source’

#deb-src http://archive.raspberrypi.org/debian/ jessie main ui

To fix the error edit the souse list and add staging to the list

sudo etc/apt/sources.list.d/*

add “staging” to the end of the list