package apport 2.20.1-0ubuntu2.5 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 127

[Srikanth]

I tried so many alternatives i didn't found relevant bug to fix it.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: apport 2.20.1-0ubuntu2.5
ProcVersionSignature: Ubuntu 4.8.0-54.57~16.04.1-generic 4.8.17
Uname: Linux 4.8.0-54-generic x86_64
ApportLog:

ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CrashReports: 600:0:116:180223:2017-07-04 20:24:38.287366390 +0530:2017-07-04 20:24:39.287366390 +0530:/var/crash/apport.0.crash
Date: Tue Jul 4 20:24:38 2017
DpkgTerminalLog:
 Preparing to unpack .../apport_2.20.1-0ubuntu2.4_all.deb ...
 /var/lib/dpkg/info/apport.prerm: 19: /var/lib/dpkg/info/apport.prerm: pyclean: not found
 dpkg: error processing archive /var/cache/apt/archives/apport_2.20.1-0ubuntu2.4_all.deb (--unpack):
  subprocess installed pre-removal script returned error exit status 127
DuplicateSignature:
 package:apport:2.20.1-0ubuntu2.5
 Preparing to unpack .../apport_2.20.1-0ubuntu2.4_all.deb ...
 /var/lib/dpkg/info/apport.prerm: 19: /var/lib/dpkg/info/apport.prerm: pyclean: not found
 dpkg: error processing archive /var/cache/apt/archives/apport_2.20.1-0ubuntu2.4_all.deb (--unpack):
  subprocess installed pre-removal script returned error exit status 127
ErrorMessage: subprocess installed pre-removal script returned error exit status 127
InstallationDate: Installed on 2017-03-30 (95 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.20
SourcePackage: apport
Title: package apport 2.20.1-0ubuntu2.5 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 127
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Benjamin Drung (bdrung)]

Thank you for taking the time to report this bug and helping to make Ubuntu better.

The relevant apport.prerm code for Ubuntu 16.04:

```
# Automatically added by dh_python2:
if which pyclean >/dev/null 2>&1; then
 pyclean -p apport
else
 dpkg -L apport | grep \.py$ | while read file
 do
  rm -f "${file}"[co] >/dev/null
   done
fi
```

pyclean should not be called if it is not found. Do you still experience this issue or can reproduce it?