Запуск Ubuntu 16.04LTS зависает перезагрузкой, а не выключением

contrib не является допустимым разделом для официальных зеркал ubuntu, поэтому критическое сообщение, которое contrib/source/Sources не может быть найдено.

repo.yandex.ru не является официальным, указанным в https: // launchpad.net/ubuntu/+archivemirrors. Раздел non-free этого зеркала не содержит никаких двоичных файлов или источников. Если вы хотите использовать зеркало Яндекса, используйте mirror.yandex.ru.

Кроме того, отсутствует список источников вашего репозитория security.ubuntu.com, что может привести к задержкам обновлений безопасности.

Вы должны установить ваши источники репозитория, по крайней мере:

deb http://ru.archive.com/ubuntu/ maverick main restricted
deb-src http://ru.archive.com/ubuntu/ maverick main restricted
deb http://security.ubuntu.com/ubuntu/ maverick main-security restricted
deb-src http://security.ubuntu.com/ubuntu/ maverick main-security restricted

Вам не хватает большого количества пакетов с этим списком, я рекомендую вам использовать список, который был предоставлен на новой установке, сохраните ниже текст как /etc/apt/sources.list:

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

deb http://ru.archive.ubuntu.com/ubuntu/ maverick main restricted
deb-src http://ru.archive.ubuntu.com/ubuntu/ maverick main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://ru.archive.ubuntu.com/ubuntu/ maverick-updates main restricted
deb-src http://ru.archive.ubuntu.com/ubuntu/ maverick-updates main restricted

## 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://ru.archive.ubuntu.com/ubuntu/ maverick universe
deb-src http://ru.archive.ubuntu.com/ubuntu/ maverick universe
deb http://ru.archive.ubuntu.com/ubuntu/ maverick-updates universe
deb-src http://ru.archive.ubuntu.com/ubuntu/ maverick-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.
deb http://ru.archive.ubuntu.com/ubuntu/ maverick multiverse
deb-src http://ru.archive.ubuntu.com/ubuntu/ maverick multiverse
deb http://ru.archive.ubuntu.com/ubuntu/ maverick-updates multiverse
deb-src http://ru.archive.ubuntu.com/ubuntu/ maverick-updates multiverse

## Uncomment the following two lines to add software from the 'backports'
## repository.
## 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://ru.archive.ubuntu.com/ubuntu/ maverick-backports main restricted universe multiverse
# deb-src http://ru.archive.ubuntu.com/ubuntu/ maverick-backports main restricted universe multiverse

## 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 maverick partner
# deb-src http://archive.canonical.com/ubuntu maverick partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu maverick main
deb-src http://extras.ubuntu.com/ubuntu maverick main

deb http://security.ubuntu.com/ubuntu maverick-security main restricted
deb-src http://security.ubuntu.com/ubuntu maverick-security main restricted
deb http://security.ubuntu.com/ubuntu maverick-security universe
deb-src http://security.ubuntu.com/ubuntu maverick-security universe
deb http://security.ubuntu.com/ubuntu maverick-security multiverse
deb-src http://security.ubuntu.com/ubuntu maverick-security multiverse