Using DD command:
Step 1:- “sudo fdisk -l” to find usb name in the system. like /dev/sdc (you can identify by Drive size)
Step 2:- “sudo dd bs=4M if=Downloads/boss-8.0-amd64-DVD-301019.iso of=/dev/sdc1 status=progress && sync”(Make Sure you have selected Correct Drive Name and iso File path)
Restore back for Bootable Drive
Step 1:- “sudo wipefs –all /dev/sdd”
Step 2:- “sudo cfdisk /dev/sdd”
Step 3:- Select Dos
Step 4:- press enter to new partitation
Step 5:- press enter to make it primary
Step 6:- Select by arrow Write and press yes and Quit
Step 7:- “sudo mkfs.vfat -n ‘Name’ /dev/sdd1” to set file format as fat
Using ddrescue command
The ddrescue tool is a popular data recovery tool that you can use to recover data from failed storage devices such as hard drives, pen drives, etc. Additionally, you can use the ddrescue tool to convert an ISO image to a startup USB drive.
Install ddrescue: $ sudo apt install gddrescue
Verify the block device volume of the USB drive: $ lsblk
Create a bootable USB stick: $ sudo ddrescue path/to/.iso /dev/sdx –force -D
Example for Ubuntu 20.04 setup: $ sudo ddrescue ubuntu-20.04-beta-desktop-amd64.iso /dev/sdb –force -D
reference link: https://www.tecmint.com/create-bootable-ubuntu-usb-disk/