The error in your logs is:
A instalar shim-signed (1.33.1~16.04.5+15+1533136590.3beb971-0ubuntu1) ...
Installing for x86_64-efi platform.
grub-install: erro: /boot/efi doesn't look like an EFI partition.
.
dpkg: erro ao processar o pacote shim-signed (--configure):
subprocesso script post-installation instalado retornou erro do status de
saída 1
The 'df' output attached to your bug report does show /dev/sda7 mounted
at /boot/efi. Please show the output of 'mount | grep /boot/efi' on your
system.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1824888
Title:
package shim-signed 1.33.1~16.04.5+15+1533136590.3beb971-0ubuntu1
failed to install/upgrade: subprocesso script post-installation
instalado retornou erro do status de saída 1
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