package tor 0.2.4.23-1 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 127

output of lsb_release-rd :
    Description: Ubuntu 14.10
    Release: 14.10

output of apt-cache policy tor :
tor:
  Installed: 0.2.4.23-1
  Candidate: 0.2.4.23-1
  Version table:
 *** 0.2.4.23-1 0
        500 http://archive.ubuntu.com/ubuntu/ utopic/universe amd64 Packages
        100 /var/lib/dpkg/status

I expect it to purge tor
but may due to running background process , it have troubel to uninstall

ProblemType: Package
DistroRelease: Ubuntu 14.10
Package: tor 0.2.4.23-1
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.7-0ubuntu8.1
AptOrdering:
 tor-geoipdb: Purge
 tor: Purge
Architecture: amd64
Date: Wed Feb 18 21:37:39 2015
DuplicateSignature: package:tor:0.2.4.23-1:subprocess installed pre-removal script returned error exit status 127
ErrorMessage: subprocess installed pre-removal script returned error exit status 127
InstallationDate: Installed on 2015-01-05 (43 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: tor
Title: package tor 0.2.4.23-1 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 127
UpgradeStatus: Upgraded to utopic on 2015-02-15 (3 days ago)
mtime.conffile..etc.tor.torrc: 2015-02-18T21:32:32.464530