Вчера я попытался установить VLC Player, и я получил Requires installation of untrusted packages ошибка. Я часами искал решение этой проблемы и, наконец, наткнулся на предложение, в котором говорилось о смене серверов для загрузки обновлений. Я сделал это, и это выдало мне ошибку 404, когда я нажал на "Проверить" в диспетчере обновлений. Я попытался переключить свой сервер обратно на основной (а после этого на несколько других), но теперь я все еще получаю ошибку 404:
И другая ошибка, которую я получаю при загрузке или обновлении:
Редактировать: Вывод cat /etc/apt/sources.list:
deb-src http://us.archive.ubuntu.com/ubuntu/ precise main restricted #Added by software-properties# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to# newer versions of the distribution.deb http://us.archive.ubuntu.com/ubuntu/ precise main restricted multiversedeb-src http://us.archive.ubuntu.com/ubuntu/ precise multiverse universe #Added by software-properties## Major bug fix updates produced after the final release of the## distribution.deb http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricted multiversedeb-src http://us.archive.ubuntu.com/ubuntu/ precise-updates restricted main multiverse universe #Added by software-properties## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu## team. Also, please note that software in universe WILL NOT receive any## review or updates from the Ubuntu security team.deb http://us.archive.ubuntu.com/ubuntu/ precise universedeb http://us.archive.ubuntu.com/ubuntu/ precise-updates universe## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu## security team.## N.B. software from this repository may not have been tested as## extensively as that contained in the main release, although it includes## newer versions of some applications which may provide useful features.## Also, please note that software in backports WILL NOT receive any review## or updates from the Ubuntu security team.deb http://us.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiversedeb-src http://us.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse #Added by software-propertiesdeb http://us.archive.ubuntu.com/ubuntu/ precise-security main restricted multiversedeb-src http://us.archive.ubuntu.com/ubuntu/ precise-security restricted main multiverse universe #Added by software-propertiesdeb http://us.archive.ubuntu.com/ubuntu/ precise-security universe## Uncomment the following two lines to add software from Canonical's## 'partner' repository.## This software is not part of Ubuntu, but is offered by Canonical and the## respective vendors as a service to Ubuntu users.deb http://archive.canonical.com/ubuntu precise partnerdeb-src http://archive.canonical.com/ubuntu precise partner## This software is not part of Ubuntu, but is offered by third-party## developers who want to ship their latest software.