由于 apport install/update 错误导致软件更新失败：
Could not install '/var/cache/apt/archives/apport_2.20.1-0ubuntu2.10_all.deb'
Subtask failed with error 139.
The upgrade will continue but the '/var/cache/apt/archives/apport_2.20.1-0ubuntu2.10_all.deb' package may not be in a working state. Please consider submitting a bug report about it.
命令行中的错误消息：
Preparing to unpack .../apport_2.20.1-0ubuntu2.10_all.deb ...
Segmentation fault
dpkg: warning: subprocess old pre-removal script returned error exit status 139
dpkg: trying script from the new package instead ...
Segmentation fault
dpkg: error processing archive /var/cache/apt/archives/apport_2.20.1-0ubuntu2.10_all.deb (--unpack):
subprocess new pre-removal script returned error exit status 139
Segmentation fault
dpkg: error while cleaning up:
subprocess installed post-installation script returned error exit status 139
Errors were encountered while processing:
/var/cache/apt/archives/apport_2.20.1-0ubuntu2.10_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
== 似乎子任务尝试使用旧版本的 deb 包更新 apport，但系统失败了。
最近，ubuntu 基础安全更新包中包含了 apport 错误修复，而这个有缺陷的更新包阻止了所有软件更新。