从 14.10 升级到 15.04 后，我尝试重新安装 fail2ban。我收到这些错误，因此我执行了 apt-get remove fail2ban，然后执行了 apt-get install fail2ban，但在安装其他软件包时仍然收到这些错误消息。
“sudo apt-get install -f”的输出
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up fail2ban (0.9.1-1) ...
Job for fail2ban.service failed. See "systemctl status fail2ban.service" and "journalctl -xe" for details.
invoke-rc.d: initscript fail2ban, action "start" failed.
dpkg: error processing package fail2ban (--configure):
subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
fail2ban
E: Sub-process /usr/bin/dpkg returned an error code (1)`
“systemctl status fail2ban.service”的输出
● fail2ban.service - Fail2Ban Service
Loaded: loaded (/lib/systemd/system/fail2ban.service; enabled; vendor preset: enabled)
Active: failed (Result: start-limit) since Sun 2015-07-26 22:03:08 EDT; 4min 48s ago
Docs: man:fail2ban(1)
Process: 3036 ExecStart=/usr/bin/fail2ban-client -x start (code=exited, status=255)
Jul 26 22:03:08 pimr15 systemd[1]: Failed to start Fail2Ban Service.
Jul 26 22:03:08 pimr15 systemd[1]: Unit fail2ban.service entered failed state.
Jul 26 22:03:08 pimr15 systemd[1]: fail2ban.service failed.
Jul 26 22:03:08 pimr15 systemd[1]: fail2ban.service holdoff time over, scheduling restart.
Jul 26 22:03:08 pimr15 systemd[1]: start request repeated too quickly for fail2ban.service
Jul 26 22:03:08 pimr15 systemd[1]: Failed to start Fail2Ban Service.
Jul 26 22:03:08 pimr15 systemd[1]: Unit fail2ban.service entered failed state.
Jul 26 22:03:08 pimr15 systemd[1]: fail2ban.service failed.
另外，我应该指出，fail2ban 确实在工作，因为“sudo fail2ban-client status”返回了我的 jails
答案1
我添加了依赖项“python3-systemd”，但仍然出现错误，不过重新启动后，dpkg 代码已修复，一切正常。加油！:D