Add troubleshooting section for Ubuntu 23.04+ installation issues

[godmial]

Description

This PR adds a troubleshooting section to the README.md to help users resolve installation issues on Ubuntu 23.04 and later versions.

Problem

On Ubuntu 23.04+, the installation script may complete successfully, but users may encounter ModuleNotFoundError errors when using commands like pkgs or scons --menuconfig. This is due to PEP 668 restrictions that prevent pip install from installing packages into system-wide locations.

Solution

Added a new "Troubleshooting" section in the README.md that:

• Explains the issue with PEP 668 restrictions on Ubuntu 23.04+
• Provides a clear solution using system package manager (apt install)
• Lists the specific packages needed: python3-tqdm and python3-kconfiglib

Changes

• Added "Troubleshooting" section after "Prepare Env" section in README.md
• Includes instructions for Ubuntu 23.04+ users to manually install missing dependencies

Testing

• Verified the documentation format and clarity
• Confirmed the solution works on Ubuntu 23.04+ systems

Related Issues

This addresses installation issues on newer Ubuntu versions where PEP 668 restrictions cause module import errors after installation.