sources.list 中的第 63行deb-src-src http://us.archive.ubuntu.com/ubuntu/ utopic main restricted是未知的sudo apt-get update，导致 Synaptic Package Manager 和 Ubuntu 软件中心崩溃。删除此行安全吗？
我的 sources.list 如下所示：
# deb cdrom:[Xubuntu 14.04.1 LTS _Trusty Tahr_ - Release amd64 (20140723)]/ trusty main multiverse restricted universe
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us.archive.ubuntu.com/ubuntu/ utopic main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ utopic-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-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://us.archive.ubuntu.com/ubuntu/ utopic universe
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic universe
deb http://us.archive.ubuntu.com/ubuntu/ utopic-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-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://us.archive.ubuntu.com/ubuntu/ utopic multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic multiverse
deb http://us.archive.ubuntu.com/ubuntu/ utopic-updates multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-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://us.archive.ubuntu.com/ubuntu/ utopic-backports main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-backports main restricted universe multiverse
deb http://us.archive.ubuntu.com/ubuntu/ utopic-security main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-security main restricted
deb http://us.archive.ubuntu.com/ubuntu/ utopic-security universe
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-security universe
deb http://us.archive.ubuntu.com/ubuntu/ utopic-security multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-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 utopic partner
deb-src http://archive.canonical.com/ubuntu utopic 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 utopic main
deb-src http://extras.ubuntu.com/ubuntu utopic main
deb http://us.archive.ubuntu.com/ubuntu/ utopic-proposed main restricted universe multiverse
# deb-src cdrom:[Xubuntu 14.04.1 LTS _Trusty Tahr_ - Release amd64 (20140723)]/ trusty main multiverse restricted universe
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic main restricted
deb-src-src http://us.archive.ubuntu.com/ubuntu/ utopic main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-updates main restricted
deb-src-src http://us.archive.ubuntu.com/ubuntu/ utopic-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-src http://us.archive.ubuntu.com/ubuntu/ utopic universe
deb-src-src http://us.archive.ubuntu.com/ubuntu/ utopic universe
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-updates universe
deb-src-src http://us.archive.ubuntu.com/ubuntu/ utopic-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-src http://us.archive.ubuntu.com/ubuntu/ utopic multiverse
deb-src-src http://us.archive.ubuntu.com/ubuntu/ utopic multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-updates multiverse
deb-src-src http://us.archive.ubuntu.com/ubuntu/ utopic-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-src http://us.archive.ubuntu.com/ubuntu/ utopic-backports main restricted universe multiverse
deb-src-src http://us.archive.ubuntu.com/ubuntu/ utopic-backports main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-security main restricted
deb-src-src http://us.archive.ubuntu.com/ubuntu/ utopic-security main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-security universe
deb-src-src http://us.archive.ubuntu.com/ubuntu/ utopic-security universe
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-security multiverse
deb-src-src http://us.archive.ubuntu.com/ubuntu/ utopic-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-src http://archive.canonical.com/ubuntu utopic partner
deb-src-src http://archive.canonical.com/ubuntu utopic partner
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb-src http://extras.ubuntu.com/ubuntu utopic main
deb-src-src http://extras.ubuntu.com/ubuntu utopic main
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic-proposed main restricted universe multiverse
答案1
看起来脚本或命令出了问题，并附加了-src许多deb行。您必须删除许多行才能修复此问题。或者，要消除此损坏，请尝试以下命令：
sed '62,$s/deb-src/deb/' /etc/apt/sources.list
检查输出并确保：
-src-src在任何未注释的行中都看不到（那些不是以 开头的行#）。- 一行带有
deb，后跟一行带有deb-src。
检查输出后，您可以通过运行以下命令使更改永久生效：
sudo sed -i.bak '62,$s/deb-src/deb/' /etc/apt/sources.list
答案2
无需删除它。只需-src从中删除
deb-src-src http://us.archive.ubuntu.com/ubuntu/ utopic main restricted
使其看起来像：
deb-src http://us.archive.ubuntu.com/ubuntu/ utopic main restricted
我发现您的 sources.list 文件中有很多这样的错误。您必须找到并编辑所有错误。
在 gedit 中打开它：sudo gedit /etc/apt/sources.list
然后在 gedit 中，编辑 > 搜索 > 替换
搜索：deb-src-src
替换为：deb-src