Installing Qt packages in support of OpenGL Python interfaces may result in messages when trying to start Spyder:

from PyQt5.QtWebEngineWidgets import QWebEnginePage

ImportError: ~/anaconda3/lib/python3.6/site-packages/numexpr/../../../libstdc++.so.6: version `CXXABI_1.3.8’ not found (required by /usr/lib/x86_64-linux-gnu/libicuuc.so.55)

from PyQt5.QtWebKitWidgets import QWebPage as QWebEnginePage ImportError: ~/anaconda3/lib/python3.6/site-packages/PyQt5/../../../libQt5WebKit.so.5: symbol _ZN13QSGRenderNodeC2Ev, version Qt_5_PRIVATE_API not defined in file libQt5Quick.so.5 with link time reference

Assuming Anaconda / Miniconda Python installed at “~/anaconda3” on Linux, try:

cp /usr/lib/x86_64-linux-gnu/libstdc++.so.6 ~/anaconda3/lib/

reference