[SOLVED] Ways to change backbox's sources.list?

[lexphantom]

Unlike Kali linux which i had experience with it before,i had simply found nothing about backbox "repositories"  on google also i got these erros :
E: Failed to stat /var/lib/apt/lists/partial/vn.archive.ubuntu.com_ubuntu_dists_xenial-updates_InRelease - pkgAcqTransactionItem::TransactionState-stat (2: No such file or directory)
E: Failed to stat /var/lib/apt/lists/partial/vn.archive.ubuntu.com_ubuntu_dists_xenial-updates_main_binary-i386_Packages - pkgAcqTransactionItem::TransactionState-stat (2: No such file or directory)
E: Failed to stat /var/lib/apt/lists/partial/vn.archive.ubuntu.com_ubuntu_dists_xenial-updates_universe_i18n_Translation-en - pkgAcqTransactionItem::TransactionState-stat (2: No such file or directory)
E: Failed to stat /var/lib/apt/lists/partial/security.ubuntu.com_ubuntu_dists_xenial-security_InRelease - pkgAcqTransactionItem::TransactionState-stat (2: No such file or directory)