我正在尝试使用以下命令安装软件包apt-get：
root@ubuntu:/# sudo apt-get install build-essential libssl-dev libcurl4-gnutls-dev libexpat1-dev gettext unzip
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libcurl4-gnutls-dev 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: Unable to locate package build-essential
E: Unable to locate package libssl-dev
E: Package 'libcurl4-gnutls-dev' has no installation candidate
E: Unable to locate package libexpat1-dev
E: Unable to locate package gettext
E: Unable to locate package unzip
我的主要目标是安装包make，我需要手动安装较低版本的 PHP
事情是这样的：
root@ubuntu:~/php-5.4.31# make
The program 'make' is currently not installed. You can install it by typing:
apt-get install make
然后我继续做apt-get install make
root@ubuntu:/# apt-get install make
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package make 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 'make' has no installation candidate
我在虚拟机 (Hyper-V) 上运行 Ubuntu 14.04.1 LTS，希望有帮助
答案1
几天前我也遇到过同样的问题。尝试运行
# apt-get update
您的 apt-repository 已过时。这可能是问题所在。