how to fix following error in ubuntu coming after installing oracle virtual box

W: Target Packages (contrib/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target Packages (contrib/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target Translations (contrib/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target Translations (contrib/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target DEP-11 (contrib/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target DEP-11 (contrib/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target DEP-11-icons-small (contrib/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target DEP-11-icons (contrib/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target DEP-11-icons-hidpi (contrib/dep11/icons-64x64@2.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target CNF (contrib/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target CNF (contrib/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target Packages (contrib/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target Packages (contrib/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target Translations (contrib/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target Translations (contrib/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target DEP-11 (contrib/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target DEP-11 (contrib/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target DEP-11-icons-small (contrib/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target DEP-11-icons (contrib/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target DEP-11-icons-hidpi (contrib/dep11/icons-64x64@2.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target CNF (contrib/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target CNF (contrib/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target Packages (contrib/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target Packages (contrib/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target Translations (contrib/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target Translations (contrib/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target DEP-11 (contrib/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target DEP-11 (contrib/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target DEP-11-icons-small (contrib/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target DEP-11-icons (contrib/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target DEP-11-icons-hidpi (contrib/dep11/icons-64x64@2.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target CNF (contrib/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target CNF (contrib/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target Packages (contrib/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target Packages (contrib/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target Translations (contrib/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target Translations (contrib/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target DEP-11 (contrib/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target DEP-11 (contrib/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target DEP-11-icons-small (contrib/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target DEP-11-icons (contrib/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target DEP-11-icons-hidpi (contrib/dep11/icons-64x64@2.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target CNF (contrib/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target CNF (contrib/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:2 W: Target Packages (contrib/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target Packages (contrib/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target Translations (contrib/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target Translations (contrib/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target DEP-11 (contrib/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target DEP-11 (contrib/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target DEP-11-icons-small (contrib/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target DEP-11-icons (contrib/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target DEP-11-icons-hidpi (contrib/dep11/icons-64x64@2.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target CNF (contrib/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target CNF (contrib/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:3 W: Target Packages (contrib/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target Packages (contrib/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target Translations (contrib/i18n/Translation-en_IN) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target Translations (contrib/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target DEP-11 (contrib/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target DEP-11 (contrib/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target DEP-11-icons-small (contrib/dep11/icons-48x48.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target DEP-11-icons (contrib/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target DEP-11-icons-hidpi (contrib/dep11/icons-64x64@2.tar) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target CNF (contrib/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4 W: Target CNF (contrib/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/virtualbox.list:1 and /etc/apt/sources.list.d/virtualbox.list:4