Plug in your USB thumbdrive and download Ubuntu 18.04 .iso file here.
Linux Instructions for creating a bootable USB image
Now, you’ll need to determine the device name of USB device; it will look something like /dev/sdc. You can use the fdisk command to do this:
$ fdisk -l
Disk /dev/sdb: 232.9 GiB, 250059350016 bytes, 488397168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 65F1D71B-D087-4A0A-8C50-1A759FCBC20D
Device Start End Sectors Size Type
/dev/sdb1 2048 1050623 1048576 512M EFI System
/dev/sdb2 1050624 471873535 470822912 224.5G Linux filesystem
/dev/sdb3 471873536 488396799 16523264 7.9G Linux swap
Disk /dev/sdc: 7.2 GiB, 7746879488 bytes, 15130624 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x663eb4c4
Device Boot Start End Sectors Size Id Type
/dev/sdc1 * 0 3815135 3815136 1.8G 0 Empty
/dev/sdc2 3737268 3741939 4672 2.3M ef EFI (FAT-12/16/32)
In this case, the thumbdrive is /dev/sdc (I can tell by the storage size). Now, copy .iso file to the USB:
sudo dd bs=16M if=<path to .iso> of=<device name> conv=fdatasync; sync;
You now have a USB that you can use to install Ubuntu 18.04.
MacOS / OSX Instructions for creating a bootable USB image
You’ll need to determine the device name of USB device; it will look something like /dev/sdc. You can use the fdisk command to do this:
$ sudo diskutil list
Disk /dev/disk1: 232.9 GiB, 250059350016 bytes, 488397168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 65F1D71B-D087-4A0A-8C50-1A759FCBC20D
Device Start End Sectors Size Type
/dev/sdb1 2048 1050623 1048576 512M EFI System
/dev/sdb2 1050624 471873535 470822912 224.5G Linux filesystem
/dev/sdb3 471873536 488396799 16523264 7.9G Linux swap
Disk /dev/disk2: 7.2 GiB, 7746879488 bytes, 15130624 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x663eb4c4
Device Boot Start End Sectors Size Id Type
/dev/sdc1 * 0 3815135 3815136 1.8G 0 Empty
/dev/sdc2 3737268 3741939 4672 2.3M ef EFI (FAT-12/16/32)
In this case, the thumbdrive is /dev/disk2 (I can tell by the storage size). Now, copy with dd the .iso file to the USB:
sudo dd bs=16m if=<path to .iso> of=<device name> && sudo sync
Wait until the sudo sync command returns and you’ll now have a bootable USB!
