package python-gst-1.0-dbg (not installed) failed to install/upgrade: trying to overwrite '/usr/lib/python2.7/dist-packages/gi/overrides/_gi_gst.so', which is also in package python-gst-1.0 1.1.90-1

[Katsiaris Simos]

i was trying to convert an mkv video to webm, also crashed lightdm

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: python-gst-1.0-dbg (not installed)
ProcVersionSignature: Ubuntu 3.13.0-8.27-generic 3.13.2
Uname: Linux 3.13.0-8-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.13.2-0ubuntu2
Architecture: amd64
Date: Wed Feb 12 15:20:50 2014
DuplicateSignature: package:python-gst-1.0-dbg:(not installed):trying to overwrite '/usr/lib/python2.7/dist-packages/gi/overrides/_gi_gst.so', which is also in package python-gst-1.0 1.1.90-1
ErrorMessage: trying to overwrite '/usr/lib/python2.7/dist-packages/gi/overrides/_gi_gst.so', which is also in package python-gst-1.0 1.1.90-1
InstallationDate: Installed on 2014-01-23 (19 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140123)
SourcePackage: gst-python1.0
SystemImageInfo: Error: [Errno 2] No such file or directory: 'system-image-cli'
Title: package python-gst-1.0-dbg (not installed) failed to install/upgrade: trying to overwrite '/usr/lib/python2.7/dist-packages/gi/overrides/_gi_gst.so', which is also in package python-gst-1.0 1.1.90-1
UpgradeStatus: No upgrade log present (probably fresh install)