Ubuntu Source list in/etc/apt/sources.list, replace it
the source of Tsinghua
Deb Http://mirrors.tuna.tsinghua.edu.cn/ubuntu/xenial main multiverse restricted Universedeb/http Mirrors.tuna.tsinghua.edu.cn/ubuntu/xenial-backports main Multiverse restricted Universedeb/http mirrors.tuna.tsinghua.edu.cn/ubuntu/xenial-proposed main Multiverse restricted Universedeb/http Mirrors.tuna.tsinghua.edu.cn/ubuntu/xenial-security main Multiverse restricted Universedeb/http Mirrors.tuna.tsinghua.edu.cn/ubuntu/xenial-updates main Multiverse restricted UNIVERSEDEB-SRC/http Mirrors.tuna.tsinghua.edu.cn/ubuntu/xenial main Multiverse restricted UNIVERSEDEB-SRC/http Mirrors.tuna.tsinghua.edu.cn/ubuntu/xenial-backports main Multiverse restricted UNIVERSEDEB-SRC/http mirrors.tuna.tsinghua.edu.cn/ubuntu/xenial-proposed main Multiverse restricted UNIVERSEDEB-SRC/http Mirrors.tuna.tsinghua.edu.cn/ubuntu/xenial-security main Multiverse restricted UNIVERSEDEB-SRC/http Mirrors.tuna.tsinghua.edu.cn/ubuntu/xenial-updates main Multiverse Restricted universe
Ali's SourceDeb Http://mirrors.aliyun.com/ubuntu/xenial main restricted universe multiverse
Deb Http://mirrors.aliyun.com/ubuntu/xenial-security main restricted universe multiverse
Deb Http://mirrors.aliyun.com/ubuntu/xenial-updates main restricted universe multiverse
Deb http://mirrors.aliyun.com/ubuntu/xenial-proposed main restricted universe multiverse
Deb Http://mirrors.aliyun.com/ubuntu/xenial-backports main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/xenial main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/xenial-security main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/xenial-updates main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/xenial-proposed main restricted universe multiverse
DEB-SRC http://mirrors.aliyun.com/ubuntu/xenial-backports main restricted universe multiverse
the official source# deb Cdrom:[ubuntu 16.04 LTS _xenial xerus_-Release amd64 (20160420.1)]/xenial main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# Newer versions of the distribution.
Deb Http://cn.archive.ubuntu.com/ubuntu/xenial main restricted
# deb-src http://cn.archive.ubuntu.com/ubuntu/xenial main restricted
# # Major bug fix updates produced after the final release of the
# # Distribution.
Deb Http://cn.archive.ubuntu.com/ubuntu/xenial-updates main restricted
# deb-src Http://cn.archive.ubuntu.com/ubuntu/xenial-updates main restricted
# # N.B. Software from this repository are entirely unsupported by the Ubuntu
# # Team, and may not is under a free licence. Satisfy yourself as to
# # Your rights to use the software. Also, please note this software in
# # Universe won't receive any review or updates from the Ubuntu security
# # Team.
Deb Http://cn.archive.ubuntu.com/ubuntu/xenial Universe
# DEB-SRC Http://cn.archive.ubuntu.com/ubuntu/xenial Universe
Deb Http://cn.archive.ubuntu.com/ubuntu/xenial-updates Universe
# DEB-SRC Http://cn.archive.ubuntu.com/ubuntu/xenial-updates Universe
# # N.B. Software from this repository are entirely unsupported by the Ubuntu
# # Team, and may not is under a free licence. Satisfy yourself as to
# # Your rights to use the software. Also, please note this software in
# # Multiverse won't receive any review or updates from the Ubuntu
# # Security Team.
Deb Http://cn.archive.ubuntu.com/ubuntu/xenial Multiverse
# DEB-SRC Http://cn.archive.ubuntu.com/ubuntu/xenial Multiverse
Deb Http://cn.archive.ubuntu.com/ubuntu/xenial-updates Multiverse
# DEB-SRC Http://cn.archive.ubuntu.com/ubuntu/xenial-updates Multiverse
# # N.B. Software from this repository and not having 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 this software in Backports won't receive any review
# # or updates from the Ubuntu security team.
Deb Http://cn.archive.ubuntu.com/ubuntu/xenial-backports main restricted universe multiverse
# deb-src Http://cn.archive.ubuntu.com/ubuntu/xenial-backports main restricted universe multiverse
# # Uncomment the following, lines to add software from Canonical ' s
# # ' partner ' repository.
# # This software was not part of Ubuntu, but was 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 Http://security.ubuntu.com/ubuntu xenial-security main restricted
# deb-src Http://security.ubuntu.com/ubuntu xenial-security main restricted
Deb Http://security.ubuntu.com/ubuntu xenial-security Universe
# DEB-SRC Http://security.ubuntu.com/ubuntu xenial-security Universe
Deb Http://security.ubuntu.com/ubuntu xenial-security Multiverse
# DEB-SRC Http://security.ubuntu.com/ubuntu xenial-security Multiverse
Deb http://cn.archive.ubuntu.com/ubuntu/xenial-proposed main restricted Multiverse universe
Ubuntu Source list (Tsinghua, Ali, official, choose one)
