steven@localhost:~$ sudo apt-get update
E: 无法识别在源列表 /etc/apt/sources.list 里，第 1 行中的软件包类别“deb”
E: 无法读取源列表。
steven@localhost:~$

把结果完全复制贴上来。

deb http://mirrors.163.com/debian jessie main non-free contrib
deb http://mirrors.163.com/debian jessie-proposed-updates main contrib non-free
deb http://mirrors.163.com/debian-security jessie/updates main contrib non-free
deb-src http://mirrors.163.com/debian jessie main non-free contrib
deb-src http://mirrors.163.com/debian jessie-proposed-updates main contrib non-free
deb-src http://mirrors.163.com/debian-security jessie/updates main contrib non-free
deb http://http.us.debian.org/debian jessie main contrib non-free
deb http://security.debian.org jessie/updates main contrib non-free

重複
改為
# deb http://http.us.debian.org/debian jessie main contrib non-free

重複
改為
# deb http://http.us.debian.org/debian jessie main contrib non-free

返回第一行有问题，但实际上没问题？倾向于楼主的 sources.list中夹杂了复制粘贴进的特殊符号？

建议楼主先废掉现有的sources.list，然后只用一行试试看。执行：

# deb cdrom:[Ubuntu 14.04 LTS _Trusty Tahr_ - Release amd64 (20140417)]/ trusty main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://mirrors.zju.edu.cn/ubuntu/ trusty main restricted
deb-src http://mirrors.zju.edu.cn/ubuntu/ trusty main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://mirrors.zju.edu.cn/ubuntu/ trusty-updates main restricted
deb-src http://mirrors.zju.edu.cn/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://mirrors.zju.edu.cn/ubuntu/ trusty universe
deb-src http://mirrors.zju.edu.cn/ubuntu/ trusty universe
deb http://mirrors.zju.edu.cn/ubuntu/ trusty-updates universe
deb-src http://mirrors.zju.edu.cn/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.

## 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://mirrors.zju.edu.cn/ubuntu/ trusty-security main restricted
deb-src http://mirrors.zju.edu.cn/ubuntu/ trusty-security main restricted
deb http://mirrors.zju.edu.cn/ubuntu/ trusty-security universe
deb-src http://mirrors.zju.edu.cn/ubuntu/ trusty-security universe

## 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

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

## Major bug fix updates produced after the final release of the
## distribution.

## 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.

## 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.

## 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://mirrors.zju.edu.cn/ubuntu/ trusty-backports main restricted universe
deb-src http://mirrors.zju.edu.cn/ubuntu/ trusty-backports main restricted universe


## 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.
milo@milo-GA-A55M-DS2:~$



怎么办？

既然有software-properties-gtk就没必要手工改/etc/apt/sources.list了吧，手工改很容易出错的。

抓錯

1. 備存
sudo cp -af /etc/apt/sources.list /etc/apt/sources.list.backup
1-1. 要恢復
sudo cp -af /etc/apt/sources.list.backup /etc/apt/sources.list
2. gksudo gedit /etc/apt/sources.list
第一次 使用 gksudo 需要先安裝 gksu 套件
把內容 全部清空
儲存
3. sudo apt-get update
如果還有錯誤訊息 複製 貼上來
3-1. 如果還有錯誤訊息
sudo ls -al /etc/apt/sources.list.d
把結果 複製 貼上來
3-2. 如果沒有錯誤訊息
請再貼文 繼續下個抓錯程序