package ipython-qtconsole 2.4.1-1 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1

[Giuseppe]

Ubuntu 16.04.
I installed spyder
I realized I have 2.7 as default python version
I added 2.7 and 3.5 versions of python to update-alternatives
I did apt-get remove spyderr
I did apt-get autoremove
after I got a lot of crashes and dependency problems.
I am going to update or to change back to python 2.7 as default

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: ipython-qtconsole 2.4.1-1
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
Date: Sat May 7 12:38:07 2016
ErrorMessage: subprocess installed pre-removal script returned error exit status 1
InstallationDate: Installed on 2016-04-30 (6 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1
 apt 1.2.10ubuntu1
SourcePackage: ipython
Title: package ipython-qtconsole 2.4.1-1 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Giuseppe (giuseppe-stecca)]

everythings is now ok after change back to python 2.7 as default (using udpate-alternatives). No way to use python 3.5 as default?

[Thomas Kluyver (takluyver)]

I think a lot of stuff will assume that the 'python' command runs Python 2. You can run Python 3.5 as 'python3'. If you want extra convenience, making 'python' a bash alias should get you what you want without interfering with the system.

[Giuseppe (giuseppe-stecca)]

So the Advice for everybody is: don't do that!

Il sabato 7 maggio 2016, Thomas Kluyver <email address hidden> ha
scritto:

> I think a lot of stuff will assume that the 'python' command runs Python
> 2. You can run Python 3.5 as 'python3'. If you want extra convenience,
> making 'python' a bash alias should get you what you want without
> interfering with the system.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1579348
>
> Title:
> package ipython-qtconsole 2.4.1-1 failed to install/upgrade:
> subprocess installed pre-removal script returned error exit status 1
>
> Status in ipython package in Ubuntu:
> New
>
> Bug description:
> Ubuntu 16.04.
> I installed spyder
> I realized I have 2.7 as default python version
> I added 2.7 and 3.5 versions of python to update-alternatives
> I did apt-get remove spyderr
> I did apt-get autoremove
> after I got a lot of crashes and dependency problems.
> I am going to update or to change back to python 2.7 as default
>
> ProblemType: Package
> DistroRelease: Ubuntu 16.04
> Package: ipython-qtconsole 2.4.1-1
> ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
> Uname: Linux 4.4.0-21-generic x86_64
> ApportVersion: 2.20.1-0ubuntu2
> Architecture: amd64
> Date: Sat May 7 12:38:07 2016
> ErrorMessage: subprocess installed pre-removal script returned error
> exit status 1
> InstallationDate: Installed on 2016-04-30 (6 days ago)
> InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64
> (20160420.1)
> PackageArchitecture: all
> RelatedPackageVersions:
> dpkg 1.18.4ubuntu1
> apt 1.2.10ubuntu1
> SourcePackage: ipython
> Title: package ipython-qtconsole 2.4.1-1 failed to install/upgrade:
> subprocess installed pre-removal script returned error exit status 1
> UpgradeStatus: No upgrade log present (probably fresh install)
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/ipython/+bug/1579348/+subscriptions
>