你好，我最近在我的 Pi 上安装了 Ubuntu Server 20.04，然后安装了 Ubuntu Desktop。
我现在正在尝试安装 Samba，以便可以与我的 Windows 系统共享，但是在尝试 sudo apt install samba samba-common-bin 或使用时出现以下错误：
chewie@ubuntu:~$ sudo apt install samba samba-common-bin
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package samba-common-bin 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
Package samba 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
However the following packages replace it:
samba-libs
E: Package 'samba' has no installation candidate
E: Package 'samba-common-bin' has no installation candidate
有人能帮忙或者告诉我为什么它不起作用吗？
非常感谢您的阅读！
deb-源文件http://ports.ubuntu.com/ubuntu-ports焦点 主要 受限
deb-源文件http://ports.ubuntu.com/ubuntu-ports焦点更新 主要 受限
deb-源文件http://ports.ubuntu.com/ubuntu-ports焦点宇宙