I was trying to upgrade Ubuntu 16.04.3 LTS to Ubuntu 17.04
I tried with commands
sudo apt update && sudo apt dist-upgrade
sudo do-release-upgrade -d
Error is shown something like this
W:Target Packages (main/binary-amd64/Packages) is configured multiple
times in /etc/apt/sources.list:1 and /etc/apt/sources.list:2,
W:Target Packages (main/binary-i386/Packages) is configured multiple
times in /etc/apt/sources.list:1 and /etc/apt/sources.list:2,
W:Target Packages (main/binary-all/Packages) is configured multiple
times in /etc/apt/sources.list:1 and /etc/apt/sources.list:2,
W:Target Translations (main/i18n/Translation-en) is configured
multiple times in /etc/apt/sources.list:1 and
/etc/apt/sources.list:2, W:Target DEP-11
(main/dep11/Components-amd64.yml) is configured multiple times in
/etc/apt/sources.list:1 and /etc/apt/sources.list:2, W:Target
DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple
times in /etc/apt/sources.list:1 and /etc/apt/sources.list:2,
W:Target Packages (main/binary-amd64/Packages) is configured multiple
times in /etc/apt/sources.list:1 and /etc/apt/sources.list:7,
W:Target Packages (main/binary-i386/Packages) is configured multiple
times in /etc/apt/sources.list:1 and /etc/apt/sources.list:7,
W:Target Packages (main/binary-all/Packages) is configured multiple
times in /etc/apt/sources.list:1 and /etc/apt/sources.list:7,
W:Target Translations (main/i18n/Translation-en) is configured
multiple times in /etc/apt/sources.list:1 and
/etc/apt/sources.list:7, W:Target DEP-11