使用的命令：
sudo apt-get install git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev python-software-properties libffi-dev
输出：
Reading package lists... Done
Building dependency tree
Reading state information... Done
curl is already the newest version.
curl set to manually installed.
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming. …package-management apt dpkg dependencies software-installation
在 Ubuntu 17.10 上E: Package 'apache2' has no installation candidate安装 apache2 时出错sudo apt-get install apache2。这是终端上显示的消息。
sudo apt-get install apache2
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package apache2 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'apache2' has no installation candidate
apt-cache policy apache2命令后的消息。
apache2:
Installed: (none)
Candidate: (none) …