Ubuntu apt 安装gedit，报错 E: Unable to correct problems, you have held broken packages.

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Ubuntu apt 安装gedit，报错 E: Unable to correct problems, you have held broken packages.

在安装软件的时候报错：
在这里插入图片描述
网上查询了很多资料，还重装了一次，都无法解决。

之后在CSDN博主「woshiheweigui」的文章中看到相似情况，
其原文链接：https://blog.csdn.net/woshiheweigui/article/details/115557020

发现是切换的国内源的问题，刚好备份了之前的源。（所以建议在切换国内镜像源同时备份之前的）发现自己的Ubuntu版本是2020的需要focal类型的源，
在这里插入图片描述

但切换的国内源是2018的bionic类型的源。
修改之前的：

#清华源
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse

于是又进行了修改：

#清华源
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse

Ubuntu各个版本的需要的源版本如下：

Ubuntu 12.04 (LTS)代号为precise。

Ubuntu 14.04 (LTS)代号为trusty。

Ubuntu 15.04 代号为vivid。

Ubuntu 15.10 代号为wily。

Ubuntu 16.04 (LTS)代号为xenial。

Ubuntu 18.04 (LTS)代号为bionic。

Ubuntu 20.04 (LTS)代号为focal。

然后再次尝试安装gedit