Aug 21 13:25:20 ubuntu kernel: [ 1270.622614] EXT4-fs error (device sda2): 
ext4_validate_inode_bitmap:101: comm grub-install: Corrupt inode bitmap - 
block_group = 704, inode_bitmap = 23068688
Aug 21 13:25:20 ubuntu kernel: [ 1270.755848] grub-install[4124]: segfault at 0 
ip 00007f6293ac942b sp 00007ffdc367d460 error 4 in 
libc-2.27.so[7f6293997000+1e7000]
Aug 21 13:25:20 ubuntu grub-installer: error: Running 'grub-install  --force 
"/dev/sda1"' failed.

It seems that your partition for installing grub is corrupted, most
probably because of that:

parted_server: OUT: 1   1048576-639631359       638582784       primary
ext4    /dev/sda1

You must install bootloader on "EFI system partition", not on ext4.

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https://bugs.launchpad.net/bugs/1788178

Title:
  Erro ao instalar grub

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