qt.qpa.xcb: could not connect to display

[517030910405]

Environment:

WSL Ubuntu 18.04.3 LTS
conda 4.7.12
python 3.7.3

run:

python index.py

result:

Select a ROI and then press SPACE or ENTER button!
Cancel the selection process by pressing c button!
qt.qpa.xcb: could not connect to display
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, minimal, minimalegl, offscreen, vnc, webgl, xcb.

Aborted (core dumped)

I don't know what happened. Thank you.

Detailed Packages

# Name Version Build Channel
_libgcc_mutex\ \ 0.1 main https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
bzip2 1.0.8 h516909a_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
ca-certificates 2019.10.16 0 anaconda
cairo 1.16.0 hfb77d84_1002 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
certifi 2019.9.11 py37_0 anaconda
cffi 1.13.1 py37h8022711_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
cudatoolkit 10.1.168 0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
cycler 0.10.0 py_2 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
dbus 1.13.6 he372182_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
expat 2.2.5 he1b5a44_1004 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
ffmpeg 4.1.3 h167e202_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
fontconfig 2.13.1 h86ecdb6_1001 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
freetype 2.10.0 he983fc9_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
gettext 0.19.8.1 hc5be6a0_1002 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
giflib 5.1.9 h516909a_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
glib 2.58.3 h6f030ca_1002 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
gmp 6.1.2 hf484d3e_1000 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
gnutls 3.6.5 hd3a4fd2_1002 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
graphite2 1.3.13 hf484d3e_1000 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
gst-plugins-base 1.14.5 h0935bb2_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
gstreamer 1.14.5 h36ae1b5_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
harfbuzz 2.4.0 h9f30f68_3 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
hdf5 1.10.5 nompi_h3c11f04_1104 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
icu 64.2 he1b5a44_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
intel-openmp 2019.4 243 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
jasper 1.900.1 h07fcdf6_1006 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
jpeg 9c h14c3975_1001 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
json 0.1.1 0 jmcmurray
kiwisolver 1.1.0 py37hc9558a2_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
lame 3.100 h14c3975_1001 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libblas 3.8.0 14_openblas https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libcblas 3.8.0 14_openblas https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libclang 9.0.0 hc9558a2_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libffi 3.2.1 he1b5a44_1006 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libgcc-ng 9.1.0 hdf63c60_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
libgfortran-ng 7.3.0 hdf63c60_2 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libiconv 1.15 h516909a_1005 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
liblapack 3.8.0 14_openblas https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
liblapacke 3.8.0 14_openblas https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libllvm9 9.0.0 hc9558a2_2 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libopenblas 0.3.7 h6e990d7_2 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libpng 1.6.37 hed695b0_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libstdcxx-ng 9.1.0 hdf63c60_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
libtiff 4.0.10 hfc65ed5_1004 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libuuid 2.32.1 h14c3975_1000 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libwebp 1.0.2 h576950b_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libxcb 1.13 h14c3975_1002 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libxkbcommon 0.9.1 hebb1f50_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libxml2 2.9.9 hee79883_5 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
lz4-c 1.8.3 he1b5a44_1001 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
matplotlib 3.1.1 py37_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
matplotlib-base 3.1.1 py37he7580a8_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
mkl 2019.4 243 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
ncurses 6.1 hf484d3e_1002 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
nettle 3.4.1 h1bed415_1002 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
ninja 1.9.0 h6bb024c_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
nspr 4.23 he1b5a44_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
nss 3.47 he751ad9_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
numpy 1.17.3 py37h95a1406_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
olefile 0.46 py_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
opencv 4.1.1 py37h0cc45ee_2 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
openh264 1.8.0 hdbcaa40_1000 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
openssl 1.1.1 h7b6447c_0 anaconda
pcre 8.43 he1b5a44_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pillow 6.2.1 py37h6b7be26_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pip 19.3.1 py37_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pixman 0.38.0 h516909a_1003 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pthread-stubs 0.4 h14c3975_1001 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pycparser 2.19 py37_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pyparsing 2.4.2 py_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pyqt 5.12.3 py37hcca6a23_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pyqt5-sip 4.19.18 pypi_0 pypi
pyqtwebengine 5.12.1 pypi_0 pypi
python 3.7.3 h33d41f4_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
python-dateutil 2.8.0 py_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pytorch 1.3.0 py3.7_cuda10.1.243_cudnn7.6.3_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch
qt 5.12.5 h0c104cb_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
qutil 3.2.1 6 jmcmurray
readline 8.0 hf8c457e_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
scipy 1.3.1 py37h921218d_2 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
setuptools 41.6.0 py37_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
six 1.12.0 py37_1000 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
sqlite 3.30.1 hcee41ef_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
tk 8.6.9 hed695b0_1003 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
torchvision 0.4.1 py37_cu101 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch
tornado 6.0.3 py37h516909a_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
wheel 0.33.6 py37_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
x264 1!152.20180806 h14c3975_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
xorg-kbproto 1.0.7 h14c3975_1002 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
xorg-libice 1.0.10 h516909a_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
xorg-libsm 1.2.3 h84519dc_1000 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
xorg-libx11 1.6.9 h516909a_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
xorg-libxau 1.0.9 h14c3975_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
xorg-libxdmcp 1.1.3 h516909a_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
xorg-libxext 1.3.4 h516909a_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
xorg-libxrender 0.9.10 h516909a_1002 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
xorg-renderproto 0.11.1 h14c3975_1002 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
xorg-xextproto 7.3.0 h14c3975_1002 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
xorg-xproto 7.0.31 h14c3975_1007 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
xz 5.2.4 h14c3975_1001 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
zlib 1.2.11 h516909a_1006 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
zstd 1.4.3 h3b9ef0a_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge

[517030910405]

Solved: WSL cannot show image.
remove all GUI and save image, and it will work