Add trouble shooting for GLIBC errors

README.md

@@ -207,6 +207,15 @@ Now, you can paste the URL (usually of the form
 provided by JupyterLab into the tunneled browser.
 
 
+## Appendix: Trouble Shooting
+
+- If you get `ImportError: [...]: version GLIBC_[...] not found` errors on
+  relatively old machines, make sure to priorize the `defaults` channel over
+  `conda-forge`.  This is done by specifying `-c defaults` **before**
+  `-c conda-forge` in `conda install` or `conda create` commands.
+
+
+
 ## Appendix: Jargon
 
 - `conda` is the package manager of the [Anaconda Python