I use fdisk -l to figure out the USB device name. The output file is /dev/sda or whatever root device name your USB stick has. The input file is the downloaded ubuntu-20.04.5-desktop-amd64.iso file. However, if there are problems, it might be an important troubleshooting step. Most of the time it is not necessary with the default dd copy block size of 512 Bytes for the input file and the output file. The sync statement flushes the disk and iso cache buffers. iso and then, as in the link above I use the command (or with superuser privileges logged in as root with sudo -i): sudo dd if= of= I use the same approach as detailed in creating Linux boot image. However, have you looked at the Ubuntu tutorials on this subject? They cover writing one on Ubuntu of course ( StartUp Disk Creator), but also MacOS & Windows too I've made no mistakes since using mkusb, and it can create persistent drives & not just the simple clones I'd create with dd.
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