package rsyslog 7.4.4-1ubuntu2.6 failed to install/upgrade: 子进程 已安装 post-installation 脚本 返回了错误号 1

I dont know what happened, (and my English is not good I think.)
When updating Ubuntu, the software seemed stopped. then I kill the Ubuntu Software Center..

then system reported that "rsyslog and grub-pc have some problem" posibily that meaning...

then theres a lock .
i used these command following:
sudo rm /var/cache/apt/archieves/lock
sudo lsof /var/cache/debconf/config.dat
sudo kill <pid>
sudo apt-get autoclean
sudo apt-get clean
sudo apt-get autoremove

then I remove & install the rsyslog and grub-pc again. No errors then.

but system report an error 10 mins lator.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: rsyslog 7.4.4-1ubuntu2.6
ProcVersionSignature: Ubuntu 3.16.0-43.58~14.04.1-generic 3.16.7-ckt13
Uname: Linux 3.16.0-43-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
Date: Mon Jul 20 12:00:05 2015
DuplicateSignature: package:rsyslog:7.4.4-1ubuntu2.6:子进程 已安装 post-installation 脚本 返回了错误号 1
ErrorMessage: 子进程 已安装 post-installation 脚本 返回了错误号 1
InstallationDate: Installed on 2015-07-20 (0 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: rsyslog
Title: package rsyslog 7.4.4-1ubuntu2.6 failed to install/upgrade: 子进程 已安装 post-installation 脚本 返回了错误号 1
UpgradeStatus: No upgrade log present (probably fresh install)