You have extra spaces in /etc/default/grub when you changed
GRUB_CMDLINE_DEFAULT:
GRUB_CMDLINE_LINUX_DEFAULT = ""
There shouldn't be spaces around the =.
Closing as Invalid since this isn't a bug in grub.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1795219
Title:
package grub-pc 2.02-2ubuntu8.4 failed to install/upgrade: instalado
grub-pc paquete post-installation guión el subproceso devolvió un
error con estado de salida 127
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