Question: **env:**ubuntu16.04 anaconda3 python3.7.8 cuda10.0 gcc5.5 command: conda activate myenv python import cv2  error: Traceback (most recent call last): File "", line 1, in File "/home/.conda/envs/myenv/lib/python3.7/site-packages/cv2/__init__.py", line 5, in from .cv2 import * ImportError: libGL.so.1: cannot open shared object file: No such file or directory I tried: RUN apt install libgl1-mesa-glx -y RUN apt-get install 'ffmpeg'\ 'libsm6'\ 'libxext6' -y  but this is already installed and the latest version(libgl1-mesa-glx18.0.5-0ubuntu0~16.04.1). then i tried: sudo apt-get install --reinstall libgl1-mesa-glx  it doesn't work. finally,I tried to remove the package: sudo apt-get --purge remove libgl1-mesa-glx  another error occurred： Reading package list... Done Analyzing the dependency tree of the package Reading status information... Done Some packages cannot be installed. If you are using an unstable distribution, this may be Because the system cannot reach the state you requested. There may be some software you need in this version The packages have not been created yet or they have been moved out of the Incoming directory. The following information may be helpful in solving the problem: The following packages have unmet dependencies: libqt5multimedia5-plugins: Dependency: libqgsttools-p1 (>= 5.5.1) but it will not be installed E: Error, pkgProblemResolver::Resolve failed. This may be due to a software package being required to maintain the status quo.  Any help would be really helpful.Thanks in advance. conda list: # packages in environment at /home/lwy/.conda/envs/mmdet1: # # Name Version Build Channel _libgcc_mutex 0.1 conda_forge https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge _openmp_mutex 4.5 1_gnu https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge addict 2.3.0 <pip> albumentations 0.5.1 <pip> appdirs 1.4.4 <pip> asynctest 0.13.0 <pip> attrs 20.2.0 <pip> ca-certificates 2020.6.20 hecda079_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge certifi 2020.6.20 py37he5f6b98_2 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge chardet 3.0.4 <pip> cityscapesScripts 2.1.7 <pip> codecov 2.1.10 <pip> coloredlogs 14.0 <pip> coverage 5.3 <pip> cycler 0.10.0 <pip> Cython 0.29.21 <pip> decorator 4.4.2 <pip> flake8 3.8.4 <pip> future 0.18.2 <pip> humanfriendly 8.2 <pip> idna 2.10 <pip> imagecorruptions 1.1.0 <pip> imageio 2.9.0 <pip> imgaug 0.4.0 <pip> importlib-metadata 2.0.0 <pip> iniconfig 1.1.1 <pip> isort 5.6.4 <pip> kiwisolver 1.3.1 <pip> kwarray 0.5.10 <pip> ld_impl_linux-64 2.35 h769bd43_9 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge libffi 3.2.1 1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free libgcc-ng 9.3.0 h5dbcf3e_17 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge libgomp 9.3.0 h5dbcf3e_17 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge libstdcxx-ng 9.3.0 h2ae2ef3_17 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge matplotlib 3.3.2 <pip> mccabe 0.6.1 <pip> mmcv 1.1.6 <pip> mmdet 1.2.0+unknown <pip> ncurses 6.2 he1b5a44_2 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge networkx 2.5 <pip> numpy 1.19.4 <pip> opencv-python 4.4.0.46 <pip> openssl 1.1.1h h516909a_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge ordered-set 4.0.2 <pip> packaging 20.4 <pip> Pillow 6.2.2 <pip> pip 20.2.4 py_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge pluggy 0.13.1 <pip> py 1.9.0 <pip> pycocotools 2.0 <pip> pycodestyle 2.6.0 <pip> pyflakes 2.2.0 <pip> pyparsing 2.4.7 <pip> pyquaternion 0.9.9 <pip> pytest 6.1.2 <pip> pytest-cov 2.10.1 <pip> pytest-runner 5.2 <pip> python 3.7.8 h6f2ec95_1_cpython https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge python-dateutil 2.8.1 <pip> python_abi 3.7 1_cp37m https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge PyWavelets 1.1.1 <pip> PyYAML 5.3.1 <pip> readline 8.0 he28a2e2_2 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge requests 2.24.0 <pip> scikit-image 0.17.2 <pip> scipy 1.5.3 <pip> setuptools 49.6.0 py37he5f6b98_2 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge Shapely 1.7.1 <pip> six 1.15.0 <pip> sqlite 3.33.0 h4cf870e_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge tifffile 2020.10.1 <pip> tk 8.6.10 hed695b0_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge toml 0.10.2 <pip> torch 1.5.0+cu92 <pip> torchvision 0.6.0+cu92 <pip> tqdm 4.51.0 <pip> typing 3.7.4.3 <pip> ubelt 0.9.3 <pip> urllib3 1.25.11 <pip> wheel 0.35.1 pyh9f0ad1d_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge xdoctest 0.15.0 <pip> xz 5.2.5 h516909a_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge yapf 0.30.0 <pip> zipp 3.4.0 <pip> zlib 1.2.11 0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free 

Answer: I have solved this problem! Firstly, find the file: find /usr -name libGL.so.1  I found /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1. Then, I created a soft link: ln -s /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 /usr/lib/libGL.so.1  Finally, I verified that it is valid: # python import cv2