我试图安装exim4，这里是命令sudo apt-get install exim4
Reading package lists... Done Building dependency tree Reading state information... Done exim4 is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 60 not upgraded. 5 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue? [Y/n] Setting up exim4-config (4.84.2-2+deb8u4) ... Adding system-user for exim (v4) groupadd: 'Debian-exim' is not a valid group name adduser: `/usr/sbin/groupadd -g 115 Debian-exim' returned error code 3. Exiting. dpkg: error processing package exim4-config (--configure): subprocess installed post-installation script returned error exit status 1 dpkg: dependency problems prevent configuration of exim4-base: exim4-base depends on exim4-config (>= 4.82) | exim4-config-2; however: Package exim4-config is not configured yet. Package exim4-config-2 is not installed. Package exim4-config which provides exim4-config-2 is not configured yet. dpkg: error processing package exim4-base (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of exim4-daemon-light: exim4-daemon-light depends on exim4-base (>= 4.84.2); however: Package exim4-base is not configured yet. dpkg: error processing package exim4-daemon-light (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of exim4: exim4 depends on exim4-base (>= 4.84.2-2+deb8u4); however: Package exim4-base is not configured yet. exim4 depends on exim4-base (<< 4.84.2-2+deb8u4.1); however: Package exim4-base is not configured yet. exim4 depends on exim4-daemon-light | exim4-daemon-heavy | exim4-daemon-custom; however: Package exim4-daemon-light is not configured yet. Package exim4-daemon-heavy is not installed. Package exim4-daemon-custom is not installed. dpkg: error processing package exim4 (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of mailutils: mailutils depends on default-mta | mail-transport-agent; however: Package default-mta is not installed. Package exim4-daemon-light which provides default-mta is not configured yet. Package mail-transport-agent is not installed. Package exim4-daemon-light which provides mail-transport-agent is not configured yet. dpkg: error processing package mailutils (--configure): dependency problems - leaving unconfigured Errors were encountered while processing: exim4-config exim4-base exim4-daemon-light exim4 mailutils E: Sub-process /usr/bin/dpkg returned an error code (1)
第一个失败是'Debian-exim' is not a valid group name
在脚本/var/lib/dpkg/info/exim4-config.postinst ，我find了引发错误的命令：
adduser --system --group --quiet --home /var/spool/exim4 --no-create-home --disabled-login --force-badname Debian-exim
这个命令的输出是
groupadd: 'Debian-exim' is not a valid group name adduser: `/usr/sbin/groupadd -g 115 Debian-exim' returned error code 3. Exiting.
在此之前，我能够在三台机器上安装Exim4。 在这个时候，我想我正在做一切。
我不知道为什么用大写字符组不想用--force-badname选项创build。
如何解决这个问题，并创build这个系统组？
Debian GNU/Linux 8.8 (jessie)
更新
我假设命令adduser --group正在使用groupadd ，它不支持--force-badname选项。 但我仍然不知道该怎么办。