You edited your /etc/default/grub file and put an incorrect space on
this line:
GRUB_CMDLINE_LINUX_DEFAULT= "quiet splash"
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1771843
Title:
package grub-efi-ia32 2.02~beta2-29ubuntu0.3 failed to
install/upgrade: subprocess installed