Add installation note for Ubuntu usersdocs: add python virtual enviro… (#1565)

…nment note for ubuntu

Added note for Ubuntu users regarding installation errors.

Author: haixuanTao

README.md

@@ -129,6 +129,8 @@ The node hub is available in the [**`dora-rs/dora-hub`**](https://github.com/dor
 pip install dora-rs-cli
 ```
 
+Note for Ubuntu users: If you encounter an 'externally-managed-environment' error during installation, try installing inside a virtual environment (python3 -m venv venv).
+
 <details close>
 <summary><b>Additional installation methods</b></summary>