package install-info 4.13a.dfsg.1-8ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2

[sosos]

in the ubuntu software center when i want to install some software always show a dialog "安装失败"

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: install-info 4.13a.dfsg.1-8ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
Date: Sun Mar 11 09:47:35 2012
DpkgTerminalLog:
 Setting up install-info (4.13a.dfsg.1-8ubuntu1) ...
 /etc/environment: 行 5: 寻找匹配的 `"' 是遇到了未预期的文件结束符
 dpkg: error processing install-info (--configure):
  subprocess installed post-installation script returned error exit status 2
DuplicateSignature:
 Setting up install-info (4.13a.dfsg.1-8ubuntu1) ...
 /etc/environment: 行 5: 寻找匹配的 `"' 是遇到了未预期的文件结束符
 dpkg: error processing install-info (--configure):
  subprocess installed post-installation script returned error exit status 2
ErrorMessage: subprocess installed post-installation script returned error exit status 2
SourcePackage: texinfo
Title: package install-info 4.13a.dfsg.1-8ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2
UpgradeStatus: Upgraded to precise on 2012-03-11 (0 days ago)

[Marcel Stimberg (marcelstimberg)]

Thank you for your bug report. It appears your file /etc/environment has a syntax error (in line 5):
 /etc/environment: 行 5: 寻找匹配的 `"' 是遇到了未预期的文件结束符
This is something that you have to fix manually. I'm marking the bug as invalid as this is not a bug in texinfo.

Please continue to report any other bug you may find.