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希望可以告诉我操作办法和命令 我使用apt-get install qmail 安装不起来 报错:
debian:~# apt-get install qmail
Reading package lists... Done
Building dependency tree... Done
Package qmail 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 qmail has no installation candidate
找不到安装文件 是怎么会事情 |
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