本文介绍了在遇到CUPS服务器错误，打印机无法连接时的排查步骤。通过查看系统日志，发现配置文件中缺少有效的Listen或Port行。通过重启服务、卸载并重装CUPS相关包，最终解决问题，打印机恢复正常。
打印机
fail to connect to server cups 服务器错误
兆芯 打印机 连不上了
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message可知 服务fail## systemd: cups.service failed.
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vim /var/log/messages
Jun 17 14:08:36 10 cupsd: No valid Listen or Port lines were found in the configuration file.
Jun 17 14:08:36 10 cupsd: No valid Listen or Port lines were found in the configuration file.
Jun 17 14:08:36 10 cupsd: No valid Listen or Port lines were found in the configuration file.
Jun 17 14:08:36 10 cupsd: No valid Listen or Port lines were found in the configuration file.
Jun 17 14:08:36 10 sys
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