"On an MBR disk, the partitioning and boot data is stored in one place. If this data is overwritten or corrupted, you're in trouble. In contrast, GPT stores multiple copies of this data across the disk, so it's much more robust and can recover if the data is corrupted."
only choice: BIOS or UEFI
"BIOS and UEFI are two firmware interfaces for computers to start the operating system. BIOS uses the Master Boot Record (MBR) to save information about the hard drive data while UEFI uses the GUID Partition Table (GPT)"
default: FAT32 (not NTFS)
default size: 16 kilo-octets
clicked the START button
chose ISO (recommended) instead of DD
installing on HAL001
booted clicking DEL
usb was on front USB and wasn't showing up
put it on back USB and started up again
CTRL-ALT-DEL
still not on there
switching usb stick to another USB pair on back
still doesn't show
on tutorial is shows that the USB drives should show up
but on my computer (an older desktop), it shows only CDROM, floppy and the hard drive
oh found this: it does show three hard drives (under Boot, Hard Drives), so reorded so USB was first
rebooting
got this screen
chose "Try or Install Ubuntu"
blank screen for 3 minutes
then Ubuntu start screen with installer
installing in Spanish so I know it replaces the other version
minimal
no third party
told it to only replace Linux (Windows is also on this machine)