# deb cdrom:[Ubuntu 15.10 _Wily Werewolf_ - Release amd64 (20151021)]/ wily main restricted
deb-src http://ubuntu.cn99.com/ubuntu/ wily main restricted #Added by software-properties

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://ubuntu.cn99.com/ubuntu/ wily main restricted
deb-src http://ubuntu.cn99.com/ubuntu/ wily multiverse universe #Added by software-properties

## Major bug fix updates produced after the final release of the
## distribution.
deb http://ubuntu.cn99.com/ubuntu/ wily-updates main restricted
deb-src http://ubuntu.cn99.com/ubuntu/ wily-updates restricted multiverse main universe #Added by software-properties

## 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://ubuntu.cn99.com/ubuntu/ wily universe
deb http://ubuntu.cn99.com/ubuntu/ wily-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://ubuntu.cn99.com/ubuntu/ wily multiverse
deb http://ubuntu.cn99.com/ubuntu/ wily-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://ubuntu.cn99.com/ubuntu/ wily-backports main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ wily-backports main restricted universe multiverse #Added by software-properties

deb http://ubuntu.cn99.com/ubuntu/ wily-security main restricted
deb-src http://ubuntu.cn99.com/ubuntu/ wily-security restricted multiverse main universe #Added by software-properties
deb http://ubuntu.cn99.com/ubuntu/ wily-security universe
deb http://ubuntu.cn99.com/ubuntu/ wily-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 wily partner
# deb-src http://archive.canonical.com/ubuntu wily partner
 

以上為原來的源，apt-update 會報錯，已經過期，找了好幾個什麼阿里，清華，網易的源都無法使用

但是怎麼使用呢？通過嘗試直接把ubuntu.cn99.com改為old-releases.ubuntu.com就可以了，下面附上修改後的，apt update 一路順暢！！！！

# deb cdrom:[Ubuntu 15.10 _Wily Werewolf_ - Release amd64 (20151021)]/ wily main restricted
deb-src http://old-releases.ubuntu.com/ubuntu/ wily main restricted #Added by software-properties

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://old-releases.ubuntu.com/ubuntu/ wily main restricted
deb-src http://old-releases.ubuntu.com/ubuntu/ wily multiverse universe #Added by software-properties

## Major bug fix updates produced after the final release of the
## distribution.
deb http://old-releases.ubuntu.com/ubuntu/ wily-updates main restricted
deb-src http://old-releases.ubuntu.com/ubuntu/ wily-updates restricted multiverse main universe #Added by software-properties

## 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://old-releases.ubuntu.com/ubuntu/ wily universe
deb http://old-releases.ubuntu.com/ubuntu/ wily-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://old-releases.ubuntu.com/ubuntu/ wily multiverse
deb http://old-releases.ubuntu.com/ubuntu/ wily-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://old-releases.ubuntu.com/ubuntu/ wily-backports main restricted universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ wily-backports main restricted universe multiverse #Added by software-properties

deb http://old-releases.ubuntu.com/ubuntu/ wily-security main restricted
deb-src http://old-releases.ubuntu.com/ubuntu/ wily-security restricted multiverse main universe #Added by software-properties
deb http://old-releases.ubuntu.com/ubuntu/ wily-security universe
deb http://old-releases.ubuntu.com/ubuntu/ wily-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 wily partner
# deb-src http://archive.canonical.com/ubuntu wily partner