How to fix Ubuntu 16.04.1 LTS updates error?

Question

ubuntu

Some index files did not download. They were ignored or older versions were used instead.
read on this forum
pingvinus.ru/answers/1128
nothing helped

Answer 1

Found the solution
sudo rm -vf /var/lib/apt/lists/*
sudo add-apt-repository --remove ppa:tualatrix/ppa
sudo apt-get update

Answer 2

clear cache /var/lib/apt/lists/
and update lists