Troubleshoot Dual Boot Windows & Ubuntu Setup

I need assistance in setting up a dual boot configuration on my Windows laptop. The desired configuration is with Windows and Ubuntu Linux, using Grub as the boot loader.

Key Requirements:
- Expertise in Windows and Ubuntu Linux
- Proficient in configuring Grub for dual boot without loosing data
- Ability to complete the task urgently

Please, only bid if you can complete this ASAP.