我一直在从 Ubuntu 18 升级到 20.04，然后升级到 20.10。现在，我需要安装virt-manager，我确信它有一个在 Ubuntu 20.10 上受支持的软件包。当我尝试使用 安装它时sudo apt-get install virt-manager，我收到未满足的依赖关系问题，指出无法安装软件包。
The following information may help to resolve the situation:
The following packages have unmet dependencies.
libvirt-glib-1.0-0 : Depends: libvirt0 (>= 1.2.8~rc2) but it is not installable
python3-libvirt : Depends: libvirt0 (>= 6.0.0-0ubuntu5) but it is not installable
Recommends: libvirt-daemon but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
我猜测我的旧包与那些包有冲突，但是由于显示的错误消息，这毫无意义。
我确实尝试过sudo apt-get update，但这并没有改变任何事情。
尝试安装依赖项会导致以下结果：
E: Package 'libvirt0' has no installation candidate
这里是/etc/apt/resource.list：
deb http://archive.ubuntu.com/ubuntu/ groovy main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ groovy main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ groovy-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ groovy-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ groovy-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ groovy-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ groovy-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ groovy-backports main restricted universe multiverse
deb http://archive.canonical.com/ubuntu groovy partner
deb-src http://archive.canonical.com/ubuntu groovy partner
我不知道为什么有些软件包无法安装，而我应该可以安装它们。有人遇到过这个问题吗？我是不是漏掉了什么？
另外，我找不到任何相关问题提到发行版升级后发生此类事情；尽管我知道未满足的依赖关系问题很多。