我一直在尝试安装 freeradius 3。我一直收到依赖性错误。我收到以下错误：
The following packages have unmet dependencies:
freeradius : Depends: libpython2.7 (>= 2.7) but it is not installable
Depends: libtalloc2 (>= 2.0.4~git20101213) but it is not installable
Depends: libwbclient0 (>= 2:4.2.1+dfsg) but it is not installable
Depends: ssl-cert but it is not installable
正如您在此处看到的，所有显示具有依赖关系的软件包也显示为不可安装。我该怎么办？