login without desktop. package cython 0.20.1+git90-g0e6e38e-1ubuntu2 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 127

[Weihao Gan]

System reboot. After login, there is no desktop.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: cython 0.20.1+git90-g0e6e38e-1ubuntu2
ProcVersionSignature: Ubuntu 3.19.0-58.64~14.04.1-generic 3.19.8-ckt16
Uname: Linux 3.19.0-58-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.14.1-0ubuntu3.23
Architecture: amd64
Date: Thu Jun 29 13:23:43 2017
DuplicateSignature: package:cython:0.20.1+git90-g0e6e38e-1ubuntu2:subprocess installed pre-removal script returned error exit status 127
ErrorMessage: subprocess installed pre-removal script returned error exit status 127
InstallationDate: Installed on 2016-04-30 (426 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.7
 apt 1.0.1ubuntu2.17
SourcePackage: cython
Title: package cython 0.20.1+git90-g0e6e38e-1ubuntu2 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 127
UpgradeStatus: No upgrade log present (probably fresh install)