Can't upgrade OS Install (MATE); How to solve, please?

Question

I have seen similar issues but am not being able to quite solve the issue...

Probably easy I guess...

W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-pt_BR) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-pt) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target CNF (main/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-pt_BR) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target Translations (main/i18n/Translation-pt) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target CNF (main/cnf/Commands-i386) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:52 and /etc/apt/sources.list.d/vivaldi.list:3

Appreciate a lot!

Answer 1

The simplest solution is to remove vivaldi.list with:

sudo rm /etc/apt/sources.list.d/vivaldi.list

and then run

sudo apt-get update
sudo apt-get upgrade