Comment 2 for bug 1512787

From log:

Preparing to unpack .../apport_2.14.1-0ubuntu3.18_all.deb ...
apport stop/waiting
/var/lib/dpkg/info/apport.prerm: 14: /var/lib/dpkg/info/apport.prerm: pyclean: not found
dpkg: warning: subprocess old pre-removal script returned error exit status 127
dpkg: trying script from the new package instead ...
/var/lib/dpkg/tmp.ci/prerm: 14: /var/lib/dpkg/tmp.ci/prerm: pyclean: not found
dpkg: error processing archive /var/cache/apt/archives/apport_2.14.1-0ubuntu3.18_all.deb (--unpack):
 subprocess new pre-removal script returned error exit status 127
/var/lib/dpkg/info/apport.postinst: 13: /var/lib/dpkg/info/apport.postinst: pycompile: not found
dpkg: error while cleaning up:
 subprocess installed post-installation script returned error exit status 127
Preparing to unpack .../python-urllib3_1.7.1-1ubuntu4_all.deb ...
/var/lib/dpkg/info/python-urllib3.prerm: 6: /var/lib/dpkg/info/python-urllib3.prerm: pyclean: not found
dpkg: warning: subprocess old pre-removal script returned error exit status 127
dpkg: trying script from the new package instead ...
/var/lib/dpkg/tmp.ci/prerm: 6: /var/lib/dpkg/tmp.ci/prerm: pyclean: not found
dpkg: error processing archive /var/cache/apt/archives/python-urllib3_1.7.1-1ubuntu4_all.deb (--unpack):
 subprocess new pre-removal script returned error exit status 127