你好先生请告诉我如何在 ubuntu 20.04 上安装 freeipa serevr 当时我开始安装时发现同样的错误所以请帮忙
dell@ipa:~$ sudo apt -y install freeipa-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package freeipa-server 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 'freeipa-server' has no installation candidate