The execution of grub-install failed. This is a fatal error

[Diego Germán Gonzalez]

The problem occurs on a computer with BIOS boot
Windows previously installed.
There is a temporary solution which is to create a new GPT partition table and reinstall all operating systems

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: ubiquity 20.10.10
ProcVersionSignature: Ubuntu 5.8.0-21.22-generic 5.8.13
Uname: Linux 5.8.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu49
Architecture: amd64
CasperMD5CheckResult: skip
CasperVersion: 1.452
Date: Mon Oct 12 14:27:55 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 20.10 "Groovy Gorilla" - Beta amd64 (20201012)
RebootRequiredPkgs:
 linux-image-5.8.0-21-generic
 linux-base
 linux-base
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)