ubuntuFailed to restart httpd.service: Unit httpd.service not found.

在Ubuntu系统中，出现"Failed to restart httpd.service: Unit httpd.service not found."的错误是因为Ubuntu默认使用的是Apache2作为Web服务器，而不是httpd。所以在Ubuntu系统中，应该使用以下命令来启动、停止或重启Apache2服务：

1. 启动Apache2服务：sudo systemctl start apache2
2. 停止Apache2服务：sudo systemctl stop apache2
3. 重启Apache2服务：sudo systemctl restart apache2

请注意，以上命令需要使用sudo权限来执行。希望对你有所帮助！<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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