When you "use the iso file directly" you attach it to the virtual machine either as a virtual hard disk, or a virtual cdrom. Either *should* work, but there are some important differences.
I suspect that the 32 bit image does not have a 32 bit grub boot loader listed in the cdrom el torito boot catalog ( this is actually a known issue ), and so it can't boot in UEFI mode. Syslinux is included in the image so that it can boot if used as a hard disk image, but if it is somehow being used by the bios when it thinks the drive is a cdrom instead, that could cause what you are seeing. If so, attaching the iso file as a virtual hard disk instead of a virtual cdrom should allow it to work. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1512811 Title: 15.10 32 bit download gives error when run from usb To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1512811/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
