Need to reinstall your PC's operating system ?

Need to reinstall your PC's operating system?
Use the Dell OS Recovery Tool to create a USB recovery drive that you
can use to reinstall the OS that came with your PC.
of Windows 7 8 or 10
https://www.dell.com/support/home/us/en/19/drivers/osiso/recoverytool/

https://www.dell.com/support/home/us/en/19/drivers/osiso/recoverytool/WT64A

or Linux
https://www.dell.com/support/home/us/en/19/drivers/osiso/recoverytool/Linux

http://releases.ubuntu.com/18.04/ubuntu-18.04.2-desktop-amd64.iso

https://wiki.ubuntu.com/BionicBeaver/ReleaseNotes

What you will need

Service Tag of the Dell PC on which you want to install Microsoft Windows or Linux

sudo dmidecode -s system-serial-number

Download and install Dell OS Recovery Tool
https://www.dell.com/support/home/Drivers/OSISO/recoverytool
(runs in Microsoft Windows only)
Blank USB flash drive 16GB or 32GB
Microsoft .Net Framework 4.7.2
https://support.microsoft.com/en-us/help/4054530/microsoft-net-framework-4-7-2-offline-installer-for-windows

Administrator user rights and at least 16GB of available storage space to download the Dell ISO recovery image