Программное обеспечение Updater дает “Отказавший для загрузки информации о хранилище - Открытым ключом не является доступная” Ubuntu 17.10

Когда я ЗАПУСКАЮ программное обеспечение Updater, я получаю ошибку.

Так Попробованный, чтобы перейти к "Другому программному обеспечению" и только проверить Canonical Partners, затем я получаю эту ошибку:

Не удалось загрузить информацию о хранилище

Ошибка W:GPG: http://archive.canonical.com точный Выпуск: следующие подписи не могли быть проверены, потому что открытый ключ не доступен: NO_PUBKEY 40976EAF437D05B5, репозиторий E:The 'http://archive.canonical.com точный Выпуск' не подписывается.

Я попробовал:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5
[sudo] password for sindre: 
Executing: /tmp/apt-key-gpghome.gl6NzrufIJ/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5

Но это не помогло. Похож на него, никогда не выполняется, потому что это выводит время. (gpg: keyserver получают отказавший: приведенное к таймауту Соединение).

Печать sources.list

# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu artful main restricted
# deb-src http://no.archive.ubuntu.com/ubuntu/ artful main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu artful-updates main restricted
# deb-src http://no.archive.ubuntu.com/ubuntu/ artful-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://archive.ubuntu.com/ubuntu artful universe
# deb-src http://no.archive.ubuntu.com/ubuntu/ artful universe
deb http://archive.ubuntu.com/ubuntu artful-updates universe
# deb-src http://no.archive.ubuntu.com/ubuntu/ artful-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://archive.ubuntu.com/ubuntu artful multiverse
# deb-src http://no.archive.ubuntu.com/ubuntu/ artful multiverse
deb http://archive.ubuntu.com/ubuntu artful-updates multiverse
# deb-src http://no.archive.ubuntu.com/ubuntu/ artful-updates multiverse

## 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://archive.ubuntu.com/ubuntu artful-backports main restricted universe multiverse
# deb-src http://no.archive.ubuntu.com/ubuntu/ artful-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 artful partner
# deb-src http://archive.canonical.com/ubuntu artful partner

deb http://archive.ubuntu.com/ubuntu artful-security main restricted
# deb-src http://security.ubuntu.com/ubuntu artful-security main restricted
deb http://archive.ubuntu.com/ubuntu artful-security universe
# deb-src http://security.ubuntu.com/ubuntu artful-security universe
deb http://archive.ubuntu.com/ubuntu artful-security multiverse
# deb-src http://security.ubuntu.com/ubuntu artful-security multiverse
deb http://archive.canonical.com/ precise partner
# deb-src http://archive.canonical.com/ precise partner