You seem to have a configuration error in your /etc/default/grub
configuration file. You have the following line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" pcie_aspm=force acpi=noirq
i915.semaphores=1
Notice how some parameters appear outside of the quotation marks. This
is incorrect and the line should look like:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi=noirq
i915.semaphores=1"
Thanks and good luck!
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/953866
Title:
package grub-pc 1.99-17ubuntu1 failed to install/upgrade:
ErrorMessage: subprocess installed post-installation script returned
error exit status 127
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