我在 ubuntu 16.04 和 20.04 上尝试过，但是无法安装dnsmasq。
我收到的错误是：
Package dnsmasq 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:
dnsmasq-base
E: Package 'dnsmasq' has no installation candidate
这个包不再在 ubuntu 仓库中可用吗？