记录更新源的文件：/etc/apt/sources.list
默认sources.list中的更新源为官方的，下载速度慢，从而需要寻找符合自己需要的更新源。
# deb cdrom:[Ubuntu 16.04.2 LTS _Xenial Xerus_ - Release amd64 (20170215.2)]/ xenial main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb mirror://mirrors.ubuntu.com/mirrors.txt xenial main restricted
deb-src mirror://mirrors.ubuntu.com/mirrors.txt xenial main restricted universe multiverse #Added by software-properties
# deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-updates main restricted
deb-src mirror://mirrors.ubuntu.com/mirrors.txt xenial-updates main restricted universe multiverse #Added by software-properties
# deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-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 mirror://mirrors.ubuntu.com/mirrors.txt xenial universe
# deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial universe
deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-updates universe
# deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-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 mirror://mirrors.ubuntu.com/mirrors.txt xenial multiverse
# deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial multiverse
deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-updates multiverse
# deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-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 mirror://mirrors.ubuntu.com/mirrors.txt xenial-backports main restricted universe multiverse
deb-src mirror://mirrors.ubuntu.com/mirrors.txt xenial-backports main restricted universe multiverse #Added by software-properties
# deb-src http://cn.archive.ubuntu.com/ubuntu/ xenial-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 xenial partner
# deb-src http://archive.canonical.com/ubuntu xenial partner
deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-security main restricted
deb-src mirror://mirrors.ubuntu.com/mirrors.txt xenial-security main restricted universe multiverse #Added by software-properties
# deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-security universe
# deb-src http://security.ubuntu.com/ubuntu xenial-security universe
deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-security multiverse
# deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse
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