Debian
grub2 package

  1. Bug #1851311
  2. Comment #33

Comment 33 for bug 1851311

Revision history for this message
C.S.Cameron (cscameron) wrote : Re: Grub 2.04 Out of memory error, No server error

Have a look in casper on the xubuntu ISO.
Confirm your menuentry uses the same as ISO:
vmlinuz or vmlinuz.efi
initrd or initrd.lz