docs: fix Ubuntu/Debian install guidance and correct UI port in quickstart (#390)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: nthmost-orkes

README.md

@@ -59,9 +59,13 @@ conductor server start
 ## Install the SDK
 
 ```shell
+python3 -m venv conductor-env
+source conductor-env/bin/activate  # Windows: conductor-env\Scripts\activate
 pip install conductor-python
 ```
 
+> **Already in a virtual environment?** Skip the `venv` step and run `pip install conductor-python` directly. On macOS, Windows, or in containers where system Python is not locked down, you can also install globally.
+
 ## 60-Second Quickstart
 
 **Step 1: Create a workflow**
@@ -162,7 +166,7 @@ python quickstart.py
 > See [Configuration](#configuration) for details.
 
 That's it — you just defined a worker, built a workflow, and executed it. Open the Conductor UI (default:
-[http://localhost:8127](http://localhost:8127)) to see the execution.
+[http://localhost:8080](http://localhost:8080)) to see the execution.
 
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