我刚刚从 12.04 更新到 14.04，现在很难设置 Apache 2.4 我收到以下错误：
Setting up apache2 (2.4.10-1+deb.sury.org~trusty+1) ...
ERROR: Module mpm_prefork is enabled - cannot proceed due to conflicts. It needs to be disabled first!
dpkg: error processing package apache2 (--configure):
subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
apache2
E: Sub-process /usr/bin/dpkg returned an error code (1)
如何禁用 mpm_prefork 以便 Apache 可以继续？