我只需要一点帮助和指导。sudo apt-get update返回此结果。我的/etc/apt/sources.list样子是这样的：
# deb cdrom:[Ubuntu-GNOME 14.04.5 LTS _Trusty Tahr_ - Release amd64 (20160803)]/ trusty main multiverse restricted universe
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://za.archive.ubuntu.com/ubuntu/ trusty main restricted
deb-src http://za.archive.ubuntu.com/ubuntu/ trusty main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://za.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
deb-src http://za.archive.ubuntu.com/ubuntu/ trusty-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://za.archive.ubuntu.com/ubuntu/ trusty universe
deb-src http://za.archive.ubuntu.com/ubuntu/ trusty universe
deb http://za.archive.ubuntu.com/ubuntu/ trusty-updates universe
deb-src http://za.archive.ubuntu.com/ubuntu/ trusty-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://za.archive.ubuntu.com/ubuntu/ trusty multiverse
deb-src http://za.archive.ubuntu.com/ubuntu/ trusty multiverse
deb http://za.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
deb-src http://za.archive.ubuntu.com/ubuntu/ trusty-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://za.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://za.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu trusty-security main restricted
deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted
deb http://security.ubuntu.com/ubuntu trusty-security universe
deb-src http://security.ubuntu.com/ubuntu trusty-security universe
deb http://security.ubuntu.com/ubuntu trusty-security multiverse
deb-src http://security.ubuntu.com/ubuntu trusty-security 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 trusty partner
# deb-src http://archive.canonical.com/ubuntu trusty 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 trusty main
deb-src http://extras.ubuntu.com/ubuntu trusty main
我该怎么做才能解决这个问题？我知道我的问题是一个复制，我需要的只是一点指导/解决方案。
答案1
可能只是服务器暂时出现问题。请尝试更换主服务器或其他服务器。