Ako zatreba: The action would require the installation of packages from not authenticated sources

Strogo nepotreban post većini!
Mada kada si već ovde veliki izgledi su da ti baš ovo treba. Dakle Ubuntu, greska 'The action would require the installation of packages from not authenticated sources'.

Rešenje iz naslova ide ovako:

sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com 40976EAF437D05B5
sudo cp -arf /var/lib/dpkg /var/lib/dpkg.backup
sudo cp /var/lib/dpkg/status-old /var/lib/dpkg/status
sudo cp /var/lib/dpkg/available-old /var/lib/dpkg/available
sudo rm -rf /var/lib/dpkg/updates/*
sudo rm -rf /var/lib/apt/lists
sudo mkdir /var/lib/apt/lists
sudo mkdir /var/lib/apt/lists/partial
sudo apt-get clean
sudo apt-get update
sudo dpkg --clear-avail
sudo dpkg --configure -a
sudo apt-get install -f
sudo apt-get update
sudo apt-get dist-upgrade

Thanks to ActionParsnip