【发布时间】：2021-10-17 10:39:18
【问题描述】：
我正在尝试在 Ubuntu 20.04 中安装 python3-dev，得到以下错误：
$ sudo apt-get install python3-dev
The following packages have unmet dependencies:
python3-dev : Depends: python3.8-dev (>= 3.8.2-1~) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
这表明我需要先安装 python3.8-dev，所以我尝试安装该软件包，但失败并出现以下错误：
$ sudo apt-get install python3.8-dev
The following packages have unmet dependencies:
python3.8-dev : Depends: zlib1g-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
我再次尝试安装包：zlib1g-dev，但也失败了：
$ sudo apt-get install zlib1g-dev
The following packages have unmet dependencies:
zlib1g-dev : Depends: zlib1g (= 1:1.2.11.dfsg-2ubuntu1) but 1:1.2.11.dfsg-2ubuntu1.2 is to be installed
E: Unable to correct problems, you have held broken packages.
最后，包 zlib1g 已经安装，但似乎 zlib1g-dev 需要不同版本的 zlib1g。但是，ubuntu 20.04 好像没有：
$ sudo apt-get install zlib1g=1.2.11.dfsg-2ubuntu1
Reading state information... Done
E: Version '1.2.11.dfsg-2ubuntu1' for 'zlib1g' was not found
此时我能做什么？
【问题讨论】：
-
为什么不直接从源安装？
-
试试
sudo aptitude install <packagename>，它可能会解决你的问题。也可以试试sudo apt-get autoremove -
感谢您的建议。
sudo aptitude install有效。通过提供的选项，我能够将zlib1g包降级到版本1:1.2.11.dfsg-2ubuntu1并安装python3-dev包。