Grub Install problem

[Wellington Torrejais da Silva]

When try to install ubuntu

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ubiquity 17.10.10
ProcVersionSignature: Ubuntu 4.13.0-21.24-generic 4.13.13
Uname: Linux 4.13.0-21-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CasperVersion: 1.387
CurrentDesktop: ubuntu:GNOME
Date: Sun Apr 8 15:35:26 2018
LiveMediaBuild: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
ProcEnviron:
 LANGUAGE=pt_BR.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pt_BR.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Wellington Torrejais da Silva (wellington1993)]

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport/report.py", line 198, in _run_hook
    symb['add_info'](report, ui)
  File "/usr/share/apport/package-hooks/source_ubiquity.py", line 60, in add_info
    syslog = report['UbiquitySyslog'].decode('utf-8', 'ignore')
AttributeError: 'str' object has no attribute 'decode'

[Phillip Susi (psusi)]

Your disk is currently partitioned to boot in bios mode, but you booted the installer in EFI mode. A warning message prompted you that this could be a problem and recommended performing a bios mode install instead, but you chose not to. You either need to perform the bios mode install, or partition the disk using GPT and set up an EFI system partition to install in EFI mode. This will be done for you if you choose the "use entire disk" guided install option.