Thanks for the file

The error is 
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash nomodeset acpi_backlight=vendor”
it should be 
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"

note the different quotes ” and "

could you please provide the output of 
$ debconf-show grub-pc

Do you remember when you first encountered this error and when and how
the parameters "nomodeset acpi_backlight=vendor" were added ?

-- 
package grub-pc 1.97~beta4-1ubuntu5 failed to install/upgrade: subprocess 
installed post-installation script returned error exit status 127 - 
/etc/default/grub: 9: splash: not found
https://bugs.launchpad.net/bugs/566819
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