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

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!

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Author: Risen