I overwrote a backup external drive ( I didn't check its presence via command just looked at it's LED which was off unknown to me the LED had just died!).If you want to create a UEFI version, in principle boot to the UEFI partition.įor years I just used dd to write the ISO to thumb-drive, but mistakes were bound to happen, and sure enough If you want to install a Legacy version of Ubuntu, you should boot into the legacy version as set in the computer's BIOS. The device is usually pretty obvious to me because of the device size.Īfter that completes, I just test the boot manually booting to the USB drive with the boot type set as Legacy or UEFI dependent on what kind of boot you want. 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.
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