伙计们。我想在我的 Ubuntu 18.04 lts 上安装 virtualbox，但是当我运行sudo apt 更新我明白了： E：列表文件 /etc/apt/sources.list (组件) 中的条目 53 格式错误 E：无法读取源列表。
以下是该列表：
# deb cdrom:[Ubuntu 18.04 LTS _Bionic Beaver_ - Release amd64 (20180426)]/ bionic main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://lt.archive.ubuntu.com/ubuntu/ bionic main restricted
# deb-src http://lt.archive.ubuntu.com/ubuntu/ bionic main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://lt.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
# deb-src http://lt.archive.ubuntu.com/ubuntu/ bionic-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://lt.archive.ubuntu.com/ubuntu/ bionic universe
# deb-src http://lt.archive.ubuntu.com/ubuntu/ bionic universe
deb http://lt.archive.ubuntu.com/ubuntu/ bionic-updates universe
# deb-src http://lt.archive.ubuntu.com/ubuntu/ bionic-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://lt.archive.ubuntu.com/ubuntu/ bionic multiverse
# deb-src http://lt.archive.ubuntu.com/ubuntu/ bionic multiverse
deb http://lt.archive.ubuntu.com/ubuntu/ bionic-updates multiverse
# deb-src http://lt.archive.ubuntu.com/ubuntu/ bionic-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://lt.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src http://lt.archive.ubuntu.com/ubuntu/ bionic-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 bionic partner
# deb-src http://archive.canonical.com/ubuntu bionic partner
deb http://security.ubuntu.com/ubuntu bionic-security main restricted
# deb-src http://security.ubuntu.com/ubuntu bionic-security main restricted
deb http://security.ubuntu.com/ubuntu bionic-security universe
# deb-src http://security.ubuntu.com/ubuntu bionic-security universe
deb http://security.ubuntu.com/ubuntu bionic-security multiverse
deb http://archive.canonical.com/ubuntu bionic multiverse
# deb-src http://archive.canonical.com/ubuntu bionic multiverse
deb http://archive.canonical.com/ubuntu multiverse
# deb-src http://archive.canonical.com/ubuntu multiverse
deb http://download.virtualbox.org/virtualbox/debian bionic contrib
# deb-src http://download.virtualbox.org/virtualbox/debian bionic contrib
# deb-src http://security.ubuntu.com/ubuntu bionic-security multiverse
抱歉，我是 Ubuntu 新手，但我认为问题出在这个上
**deb http://archive.canonical.com/ubuntu multiverse**(??)
哪里可能存在问题？谢谢！
答案1
不正确的行如下：
deb http://archive.canonical.com/ubuntu multiverse
缺少 ubuntu 版本名称。
正确的做法是：
deb http://archive.canonical.com/ubuntu bionic multiverse
错误行上方两行已经存在，并且包含发布名称：bionic。
您应该删除或注释掉#不正确的行，保存sources.list文件并运行：
sudo apt update
保存后即可。
编辑步骤：
- 打开终端并输入
sudo nano /etc/apt/sources.list。 - 输入您的用户密码以继续。
- 找到第 53 行 (
deb http://archive.canonical.com/ubuntu multiverse)。 #在该行的开头添加一个空格。- 该行现在应如下所示：
# deb http://archive.canonical.com/ubuntu multiverse。 - 按Ctrl-X并回答问题，使用Y和保存修改后的文件Enter。
- 现在应该保存文件并关闭编辑器。运行
sudo apt update系统以了解您所做的更改，然后就没问题了。