# Error: Python GUI toolkit for qt5 is not installed

**URL:** <https://discourse.julialang.org/t/error-python-gui-toolkit-for-qt5-is-not-installed/21636>\
**Category:** General Usage\
**Created:** [March 8, 2019, 3:25pm UTC](https://discourse.julialang.org/t/error-python-gui-toolkit-for-qt5-is-not-installed/21636 "2019-03-08T15:25:17Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![boutor2](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/boutor2/32/27869_2.png) [@boutor2](https://discourse.julialang.org/u/boutor2)\
**Post date:** [March 8, 2019, 3:25pm UTC](https://discourse.julialang.org/t/error-python-gui-toolkit-for-qt5-is-not-installed/21636/1 "2019-03-08T15:25:17Z")

</div>

Hi,  
I have a problem with PyCall. I want to use Qt5 backend (in Juno). I thus change the default backend (tk) doing:

```julia
using PyCall
pygui(:qt5)

```

And I get the following message: “Python GUI toolkit for qt5 is not installed”. However, Qt5 is installed in Python. It is in fact its default backend - the following lines in Python:

```julia
import matplotlib.pyplot as plt
plt.get_backend()

```

give “Qt5Agg”.  
Any one can help?