Troubleshooting Unbootable Dual Boot System and resizing partitions using Linux BusyBox and GRUB

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(Revised Version 2024) - A Comprehensive Guide to Partition Resizing Using GRUB and BusyBox in Linux (by making 5 mistakes).(Revised Version 2024) - A Comprehensive Guide to Partition Resizing Using GRUB and BusyBox in Linux (by making 5 mistakes).

The original Article and intention reviewing and re-posting

Having originally written this article in April 2020, the challenges regarding storage management using dual boot systems such as Windows 10 and Ubuntu/Linux remain equally relevant in 2024 and beyond. One needs to learn how to deal with a computer’s files, partitioning, and its limitations, and essential in the event of an emergency.

In this article, I will take you through the process step by step showing how you can make good use of GRUB commands and BusyBox on Linux to be able to navigate your file system out of crash system disasters. This knowledge can become necessary when it is impossible to boot normally and there are no prompts. Learning how to skillfully utilize this method in such situations becomes a lifeline for system failure.

Mistake 1

This is a screenshot (on Medium article) of GParted showing Gigabytes and available storage space on each partition. Throughout this article, I will detail the mistakes that I made and how I eventually sorted it out and rebooted successfully.

Trying to resize or move a dual boot partition can entail more than simply clicking and dragging to resize. Recently I needed to shrink a Windows 10 partition and extend a partition in Ubuntu. After reading some articles, I created an unallocated 10GB on C:/ drive in Windows 10 and hoped it would be just a simple matter of taking from one partition and extending another. But it just wasn’t so simple.

Mistake 2

The first thought I had after flicking through tutorials on how to resize dual boot partitions on Windows, using Disk Management, was that it would be an easy process, just a matter of snipping a bit off one partition and adding to the other. Having then read an article on Partition Wizard, I thought it would be no problem at all, and seemed I could resize both Windows and Ubuntu partitions using the wizard. How wrong I was.

https://www.partitionwizard.com/resizepartition/resize-partition-ubuntu.html

Mistakes 3 and 4

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