Hello, I think these lines in your logs mean that your system BIOS is configured to prevent changing the boot environment. Look for "antivirus" or "boot protection" in your BIOS.
Jul 15 20:59:06 ubuntu grub-installer: grub-install: aviso: No se puede establecer la variable de EFI Boot0003. Jul 15 20:59:06 ubuntu grub-installer: grub-install: aviso: efivarfs_set_variable: writing to fd 8 failed: Argumento inválido. Jul 15 20:59:06 ubuntu grub-installer: grub-install: aviso: _efi_set_variable_mode: ops->set_variable() failed: Argumento inválido. Jul 15 20:59:06 ubuntu grub-installer: grub-install: error: no se pudo registrar la entrada de arranque de EFI: Argumento inválido. Thanks ** Information type changed from Private Security to Public ** Changed in: grub-installer (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2073167 Title: No puedo instalar To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/2073167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs