So I am wondering if I can have an ALL ext4 bootable USB without having to have a windows type partition on it. Probably want to boot without the McAfee encryption program flagging it to begin it.
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Flash drives used to be small, it was easier and cheaper to make a persistent install that uses a compressed file for the OS than extracting the full OS to a larger expensive USB.
Today large flash drives are inexpensive and it is easy to make a Full install to flash drive similar as installing to internal drive.
With a Full install only one partition is required, and it can have an ext 2, 3 or 4 filesystem.
However Full install flash drives are not much use at installing Ubuntu.
I do not know of any Boot drive apps that work without a MS filesystem. Syslinux installers all require FAT or NTFS as most are Windows programs, grub2 UEFI requires a MS partition.
It is possible to install grub2 to an ext flash drive and either loopmount the ISO or extract the ISO to a partition if booting BIOS is OK, no MS partition is required.
A loop mounted ISO can be used for installing Ubuntu.
C.S.Cameron
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