While they may have occurred while upradeing ubuntustudio-lowlatency-
settings, the key is here:

device-mapper: reload ioctl on osprober-linux-sda4  failed: Device or resource 
busy
Command failed.

This tells me that it wasn't the  package itself that failed, but
rather, os-proper or grub failed to open a necessary device during the
grub-update command.

** Package changed: ubuntustudio-default-settings (Ubuntu) => os-prober
(Ubuntu)

** Changed in: os-prober (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1888791

Title:
  package ubuntustudio-lowlatency-settings 20.04.2.1 failed to
  install/upgrade: installed ubuntustudio-lowlatency-settings package
  post-installation script subprocess returned error exit status 1

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