我试图在 debian jessie 上安装 flowvisor。但我收到以下错误：
The following packages have unmet dependencies:
flowvisor : Depends: openjdk-6-jre-headless which is a virtual package.
但我已经安装了这些软件包：
default-jre-headless
openjdk-7-jre-headless
libjpeg8
那么接下来我应该安装什么？谢谢！
答案1
如图所示八重洲，该软件包取决于openjdk-6-jre-headlessDebian Jessie 中不可用的软件包。它在 Debian不稳定版中可用，因此如果您确实想要的话，可以从那里安装它，但建议请求一个新的软件包flowvisor更好（OpenJDK 6很旧，我不知道它的安全支持有多好）。
与此同时，您可以使用equivs构建一个假包来openjdk-7-jre-headless代替：
# as root
apt-get install equivs
# as yourself
equivs-control openjdk-6-jre-headless.control
编辑生成的openjdk-6-jre-headless.control文件，使其包含以下内容：
### Commented entries have reasonable defaults.
### Uncomment to edit them.
Source: openjdk-6
Section: java
Priority: optional
# Homepage: <enter URL here; no default>
Standards-Version: 3.9.6
Package: openjdk-6-jre-headless
Version: 7u79-2.5.5-1
Maintainer: Your Name <[email protected]>
Depends: openjdk-7-jre-headless
Architecture: all
# Copyright: <copyright file; defaults to GPL2>
# Changelog: <changelog file; defaults to a generic changelog>
# Readme: <README.Debian file; defaults to a generic one>
# Extra-Files: <comma-separated list of additional files for the doc directory>
# Files: <pair of space-separated paths; First is file to include, second is destination>
# <more pairs, if there's more than one file to include. Notice the starting space>
Description: OpenJDK Java runtime, using Hotspot JIT (headless)
Minimal Java runtime - needed for executing non GUI Java programs,
using Hotspot JIT.
.
The packages are built using the IcedTea build support and patches
from the IcedTea project.
.
This dummy package depends on OpenJDK 7.
（替换行中的值Maintainer:）。然后生成虚拟包：
equivs-build openjdk-6-jre-headless.control
并安装它：
# as root
dpkg -i openjdk-6-jre-headless_7u79-2.5.5-1_all.deb
然后您应该能够安装flowvisor.如果它不明确使用openjdk-6路径，它应该可以正常工作。