On both of my computers, I am unable to run the live-image. I followed precisely the instructions here and created the install drive with etcher. After selecting the first menu entry

PureOS Live [EFI/GRUB]

grub prints out:

error: no suitable video mode found.
Booting in blind mode

When manually setting gfxterm as terminal output it works again. I added those lines in the boot entry before loading the linux kernel:

insmod efi_gop
insmod efi_uga
insmod font
insmod gfxterm
set gfxmode=auto
set gfxpayload=keep
terminal_output gfxterm

These lines need to be added to grub.cfg