尽管 courier 软件包是操作系统提供的，但在 Ubuntu 20.04 上安装 Courier 1.0.6-1build2 失败。问题发生在安装后脚本中，该脚本使软件包安装但未配置，并且所有依赖软件包都存在问题。
该情况已报告给 Ubuntu（见https://bugs.launchpad.net/ubuntu/+source/courier/+bug/1877862)，但除了›确认‹之外，似乎什么也没有发生。
有解决方法吗？
我可以提供什么来帮助解决问题？（我有点迷茫。）
添加：这是安装过程的结果：
Selecting previously unselected package courier-mta.
(Reading database ... 211821 files and directories currently installed.)
Preparing to unpack .../courier-mta_1.0.6-1build2_amd64.deb ...
Adding 'diversion of /usr/bin/addcr to /usr/bin/addcr.ucspi-tcp by courier-mta'
Adding 'diversion of /usr/share/man/man1/addcr.1.gz to /usr/share/man/man1/addcr.ucspi-tcp.1.gz by courier-mta'
Unpacking courier-mta (1.0.6-1build2) ...
(Reading database ... 211980 files and directories currently installed.)
Removing libgnutls-openssl27:amd64 (3.6.13-2ubuntu1.6) ...
Setting up libnet-cidr-perl (0.20-1) ...
Setting up courier-mta (1.0.6-1build2) ...
update-alternatives: using /usr/bin/lockmail.courier to provide /usr/bin/lockmail (lockmail) in auto mode
update-alternatives: using /usr/bin/preline.courier to provide /usr/bin/preline (preline) in auto mode
'/dev/null' -> '/etc/courier/esmtpd.pem.cert'
Generating a 3072 bit RSA private key...
Generating a self signed certificate...
X.509 Certificate Information:
Version: 3
Serial Number (hex): 01
Validity:
Not Before: Mon Feb 28 07:26:38 UTC 2022
Not After: Tue Feb 28 07:26:38 UTC 2023
Subject: C=US,ST=NY,L=New York,O=Courier Mail Server,OU=Automatically-generated ESMTP SSL key,CN=localhost
Subject Public Key Algorithm: RSA
Algorithm Security Level: High (3072 bits)
Modulus (bits 3072):
00:cf:bb:56:4b:11:f4:74:b4:62:57:8c:9a:3b:a1:fb
[…snip…]
9a:f7:ec:0b:53:e2:da:b6:8c:92:20:74:c7:26:8f:bd
57
Exponent (bits 24):
01:00:01
Extensions:
Basic Constraints (critical):
Certificate Authority (CA): FALSE
Subject Alternative Name (not critical):
RFC822Name: [email protected]
Subject Key Identifier (not critical):
c93fd83531f7869e17fc0ffd69b74e6d8679783c
Other Information:
Public Key ID:
sha1:c93fd83531f7869e17fc0ffd69b74e6d8679783c
sha256:8da9285446d5dc9ccf8aa0cd4e71a620a282ae9df5920604387cba845529c87b
Public Key PIN:
pin-sha256:jakoVEbV3JzPiqDNTnGmIKKCrp31kgYEOHy6hFUpyHs=
Signing certificate...
Job for courier-msa.service failed because the control process exited with error code.
See "systemctl status courier-msa.service" and "journalctl -xe" for details.
invoke-rc.d: initscript courier-msa, action "start" failed.
● courier-msa.service - LSB: Courier MSA server
Loaded: loaded (/etc/init.d/courier-msa; generated)
Active: failed (Result: exit-code) since Mon 2022-02-28 08:26:47 CET; 16ms ago
Docs: man:systemd-sysv-generator(8)
Process: 2156320 ExecStart=/etc/init.d/courier-msa start (code=exited, status=2)
Feb 28 08:26:47 inet systemd[1]: Starting LSB: Courier MSA server...
Feb 28 08:26:47 inet courier-msa[2156320]: * Starting Courier MSA server esmtpd-msa
Feb 28 08:26:47 inet systemd[1]: courier-msa.service: Control process exited, code=exited, status=2/INVALIDARGUMENT
Feb 28 08:26:47 inet systemd[1]: courier-msa.service: Failed with result 'exit-code'.
Feb 28 08:26:47 inet systemd[1]: Failed to start LSB: Courier MSA server.
dpkg: error processing package courier-mta (--configure):
installed courier-mta package post-installation script subprocess returned error exit status 1
Processing triggers for systemd (245.4-4ubuntu3.15) ...
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for libc-bin (2.31-0ubuntu9.2) ...
Errors were encountered while processing:
courier-mta
E: Sub-process /usr/bin/dpkg returned an error code (1)
Setting up courier-mta (1.0.6-1build2) ...
Job for courier-msa.service failed because the control process exited with error code.
See "systemctl status courier-msa.service" and "journalctl -xe" for details.
invoke-rc.d: initscript courier-msa, action "start" failed.
● courier-msa.service - LSB: Courier MSA server
Loaded: loaded (/etc/init.d/courier-msa; generated)
Active: failed (Result: exit-code) since Mon 2022-02-28 08:27:00 CET; 17ms ago
Docs: man:systemd-sysv-generator(8)
Process: 2157082 ExecStart=/etc/init.d/courier-msa start (code=exited, status=2)
Feb 28 08:27:00 inet systemd[1]: Starting LSB: Courier MSA server...
Feb 28 08:27:00 inet courier-msa[2157082]: * Starting Courier MSA server esmtpd-msa
Feb 28 08:27:00 inet systemd[1]: courier-msa.service: Control process exited, code=exited, status=2/INVALIDARGUMENT
Feb 28 08:27:00 inet systemd[1]: courier-msa.service: Failed with result 'exit-code'.
Feb 28 08:27:00 inet systemd[1]: Failed to start LSB: Courier MSA server.
dpkg: error processing package courier-mta (--configure):
installed courier-mta package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
courier-mta
Press Return to continue, 'q' followed by Return to quit.
看来，courier-msa 无法启动，原因是“参数无效”。系统日志未显示任何其他信息。
添加：courier-mta-ssl 守护进程似乎显示了类似的问题：启动失败并且系统日志显示›INVALIDARGUMENT‹。