我想安装 Vagrant。当我尝试安装 Vagrant（使用 dpkg -i 命令）时，出现如下错误：
Package ruby-bundler is not installed.
vagrant depends on ruby-childprocess (>= 0.3.7); however:
Package ruby-childprocess is not installed.
vagrant depends on ruby-erubis (>= 2.7.0); however:
Package ruby-erubis is not installed.
vagrant depends on ruby-i18n (>= 0.6.0); however:
Package ruby-i18n is not installed.
vagrant depends on ruby-listen; however:
Package ruby-listen is not installed.
vagrant depends on ruby-log4r (>= 1.1.9); however:
Package ruby-log4r is not installed.
vagrant depends on ruby-nokogiri; however:
Package ruby-nokogiri is not installed.
vagrant depends on ruby-rb-inotify; however:
Package ruby-rb-inotify is not installed.
vagrant depends on ruby-rest-client; however:
Package ruby-rest-client is not installed.
当我尝试使用 apt-get 命令安装上述各个依赖项时，我看到如下错误：
E：软件包‘ruby-rest-client’没有安装候选项
是否有可以配置的存储库以便能够安装这些 ruby 依赖项？我的 /etc/apt/sources.list 文件显示以下条目：
deb http:// us.archive.ubuntu.com/ubuntu/ trusty main
deb-src http:// us.archive.ubuntu.com/ubuntu/ trusty main
###### Ubuntu Update Repos
deb http:// us.archive.ubuntu.com/ubuntu/ trusty-security main
deb http:// us.archive.ubuntu.com/ubuntu/ trusty-updates main
deb-src http:// us.archive.ubuntu.com/ubuntu/ trusty-security main
deb-src http:// us.archive.ubuntu.com/ubuntu/ trusty-updates main
（http 构造函数后没有空格。我把空格放在那里是因为我无法发布链接。）
是否有一个我可以添加的免费 repo 的 URL？
答案1
你有主要的启用后，您需要添加宇宙repos，因为它不是核心维护包，搜索 ubuntu 包会显示哪些 repo 包来自http://packages.ubuntu.com/trusty/ruby-rest-client
将以下行添加到您的 apt sources.list，然后添加 apt-get update：
# Universe Repos
deb http://us.archive.ubuntu.com/ubuntu/ trusty universe
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty universe
###### Ubuntu Update Repos Universe
deb http://us.archive.ubuntu.com/ubuntu/ trusty-security universe
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-security universe
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates universe