The actual error in your logs is:
dpkg: erro ao processar o pacote grub-pc (--configure):
o subprocesso instalado, do pacote grub-pc, o script post-installation
retornou erro do status de saída 10
I suggest you try running 'sudo dpkg --configure -a' from a terminal.
** Changed in: grub2-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1891511
Title:
dpkg: error: cannot access the file '/.deb': File or directory does
not exist
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