If you sure you want to use dd, here is the step by step guide.
First, identify your USB stick (a.k.a USB drive) on your system using this command
sudo fdisk –l.
The USB stick in my case is
/dev/sdb as you can see in the picture. So let’s unmount it via this command
umount /dev/sdb*. Unmounting is nothing but an removing device from directory tree. Which prevents device from data loss.
Then, format the USB stick by this command
mkfs.vfat /dev/sdb –I. This command create FAT file system on the flash drive (USB stick).
After that, we use this command to create the bootable USB stick.
dd if=~/Downloads/Ubuntu2004.iso of=/dev/sdb
if (input file) : the ISO image of the operating system.
of (output file) : the USB stick mount point.
dd progress use this command
pgrep –l ‘^dd$’ which will print a process id. stop / kill this process id after finishing dd work by this command
kill –USR1 process-id for example
kill –USR1 6762.
That’s it. Your USB stick is bootable and ready to be used.
If you used the USB stick and want to format it to be normal storage device, just use this command
sudo mkfs.vfat /dev/sdb –I.