iNetSec: 安装mailman时显示： Package mailman 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 'mailman' has no installation candidate 更换源也没用。

2301_76552490: 根据多次踩坑经验告诉我，强烈建议大家到清华源下载5.1.2版本。

2301_76552490: 额，按照教程，我成功的卡在了61%的进度了

tboyer: cat /proc/version

tboyer: 结果中会写，目前是Debian 10