Cantor is unable to initialize installed sage backend

Bug #1743774 reported by Norbert on 2018-01-17
This bug affects 1 person
Affects Status Importance Assigned to Milestone
cantor (Ubuntu)

Bug Description

Steps to reproduce:
1. Install Cantor from official repository

    sudo apt-get install cantor cantor-backend-sage

2. Install SageMath 7.5.1~aimsppa5 from their PPA:

    sudo add-apt-repository ppa:aims/sagemath
    sudo apt-get update
    sudo apt-get install sagemath-upstream-binary-full

3. Make sure that SageMath is working from terminal
4. Launch Cantor from terminal with `cantor` and select Sage backend at start

Expected results:
Cantor started Sage backend, and user is able to work with it

Actual results:
Cantor started Sage backend, but user is unable to work with it. It shows window "Initializing Session" and messages in the terminal:

$ cantor
Object::disconnect: Unexpected null parameter
cantor(4104)/kdeui (kdelibs): Attempt to use QAction "" with KXMLGUIFactory!

this bug is inspired by AskUbuntu question (

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: cantor-backend-sage 4:4.13.3-0ubuntu0.1
ProcVersionSignature: Ubuntu 3.13.0-139.188-generic 3.13.11-ckt39
Uname: Linux 3.13.0-139-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.27
Architecture: amd64
CurrentDesktop: KDE
Date: Wed Jan 17 16:03:35 2018
SourcePackage: cantor
UpgradeStatus: No upgrade log present (probably fresh install)

Norbert (nrbrtx) wrote :
summary: - Cantor is unable initialize installed sage backend
+ Cantor is unable to initialize installed sage backend
Sirgienko Nikita (mmmm98) wrote :

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