正在设置 Postfix 但没有走得太远，因为 Ubuntu 返回了一个依赖项错误。
试图解决这个问题，但我找不到问题的原因。
dpkg: dependency problems prevent configuration of linux-image-extra-3.13.0-43-generic:
linux-image-extra-3.13.0-43-generic depends on
linux-image-3.13.0-43-generic; however: Package
linux-image-3.13.0-43-generic is not installed.
dpkg: error processing package linux-image-extra-3.13.0-43-generic
(--configure): dependency problems - leaving unconfigured dpkg:
dependency problems prevent configuration of
linux-image-extra-3.13.0-40-generic:
linux-image-extra-3.13.0-40-generic depends on
linux-image-3.13.0-40-generic; however: Package
linux-image-3.13.0-40-generic is not configured yet.
dpkg: error processing package linux-image-extra-3.13.0-40-generic
(--configure): dependency problems - leaving unconfigured dpkg:
dependency problems prevent configuration of
linux-image-extra-3.13.0-41-generic:
linux-image-extra-3.13.0-41-generic depends on
linux-image-3.13.0-41-generic; however: Package
linux-image-3.13.0-41-generic is not configured …