So what OS does that another computer have from which you downloaded the OS?
Okay, by the way follow my steps:
If using Ubuntu
install unetbootin from here
Select the ISO option and locate the iso file and select it.
*IMPORTANT Select USB Drive from "Type" and select your drive if you have multiple drives attached to your computer.
Press OK and wait for the process to complete.
Remove the drive if a prompt shows that the process is complete.
If using windows(any version):
Download and install unetbootin from here
Do the same steps from above above step 2(lol)
Remove the usb when process is complete.
INSTALLATION:
Plug the usb after powering off the computer.
Power on the pc and select the usb from boot options( Press f8,f10,f12 or del to get boot options).
Select usb drive from boot options.
Another boot option comes up which is created by unetbootin.
Select "Install Ubuntu" from the options and press enter.
Complete the process of installation.
Reboot computer and remove usb drive.
Run sudo apt update and sudo apt upgrade so that the softwares are uptodate.