That is, there is a space here between LIN and UX that should not be
there:
GRUB_CMDLINE_LIN UX_DEFAULT="quiet splash i8042.nomux i8042.nopnp
i8042.noloop"
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Thank you for your bug report. I don't understand how your touchpad not
working is relevant to your bootloader not installing, please open a
separate bug for that.
For the bootloader issue, it seems you broke your /etc/default/grub,
please go ahead and fix it back up.
** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1936381
Title:
package grub-pc 2.04-1ubuntu35.6 failed to install/upgrade: installed
grub-pc package