配置测试的输出是：
apache2: Syntax error on line 216 of /etc/apache2/apache2.conf: Could not open configuration file /etc/apache2/conf-enabled/nagios3.conf: No such file or directory
Action 'configtest' failed.
The Apache error log may have more information.
dpkg: error processing package openstack-dashboard-ubuntu-theme (--remove):
subprocess installed post-removal script returned error exit status 1
Errors were encountered while processing:
openstack-dashboard-ubuntu-theme
E: Sub-process /usr/bin/dpkg returned an error code (1)
答案1
对于第一个错误：配置测试的输出是：
apache2: Syntax error on line 216 of /etc/apache2/apache2.conf:
Could not open configuration file /etc/apache2/conf-enabled/nagios3.conf: No such file or directory Action 'configtest' failed.
我的答案：
我使用重新配置了 resolv.conf 文件vi /etc/resolv.conf并设置了 dns ip，以便系统现在能够解析主机，现在系统没有显示错误。
答案2
看起来您已经安装了 nagios，然后启用了 nagios Web 界面，然后卸载了 nagios？这导致了悬空符号链接/etc/apache2/conf-enabled/nagios3.conf。您应该能够使用 ls 命令确认它是否悬空。
如果确实是悬空的，那么只需rm /etc/apache2/conf-enabled/nagios3.conf这样，apache 就可以正常工作了。为了以防万一，请检查 中是否还有其他悬空符号链接/etc/apache2/conf-enabled/。