installation on /dev/sda3 impossible because of grub install crash

[opa mike]

Nov 7 16:16:30 ubuntu /usr/bin/in-target: warning: /target/etc/mtab won't be updated since it is a symlink.
Nov 7 16:16:30 ubuntu in-target: Quelldatei `/etc/default/grub'
Nov 7 16:16:31 ubuntu in-target: Quelldatei `/etc/default/grub.d/init-select.cfg'
Nov 7 16:16:34 ubuntu systemd[1]: target-dev-pts.mount: Succeeded.
Nov 7 16:16:34 ubuntu systemd[2097]: target-dev-pts.mount: Succeeded.
Nov 7 16:16:34 ubuntu systemd[1]: target-run.mount: Succeeded.
Nov 7 16:16:34 ubuntu systemd[2097]: target-run.mount: Succeeded.
Nov 7 16:16:34 ubuntu systemd[1]: target-proc.mount: Succeeded.
Nov 7 16:16:34 ubuntu systemd[2097]: target-proc.mount: Succeeded.
Nov 7 16:16:34 ubuntu grub-installer: info: architecture: amd64/efi
Nov 7 16:16:34 ubuntu grub-installer: info: Mounting /proc into /target
Nov 7 16:16:34 ubuntu ubiquity: File descriptor 3 (pipe:[75403]) leaked on lvdisplay invocation. Parent PID 44998: /bin/sh
Nov 7 16:16:34 ubuntu ubiquity: Volume group "sda" not found
Nov 7 16:16:34 ubuntu ubiquity: Cannot process volume group sda
Nov 7 16:16:34 ubuntu grub-installer: info: Identified partition label for /dev/sda3: msdos
Nov 7 16:16:34 ubuntu grub-installer: info: Installing grub on '/dev/sda'
Nov 7 16:16:34 ubuntu grub-installer: info: grub-install does not support --no-floppy
Nov 7 16:16:34 ubuntu grub-installer: info: Running chroot /target grub-install --force --target x86_64-efi "/dev/sda"
Nov 7 16:16:34 ubuntu grub-installer: x86_64-efi wird für Ihre Plattform installiert.
Nov 7 16:16:35 ubuntu grub-installer: grub-install: Fehler: »/usr/lib/grub/x86_64-efi-signed/grubx64.efi.signed« kann nicht nach »/boot/efi/EFI/ubuntu/grubx64.efi« kopiert werden: Auf dem Gerät ist kein Speicherplatz mehr verfügbar.
Nov 7 16:16:35 ubuntu grub-installer: error: Running 'grub-install --force --target x86_64-efi "/dev/sda"' failed.

There is no EFI on this machine !!!

Workaround is required to install ubuntu on a a separate partition or on an external USB-drive.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: ubiquity 20.10.13
ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14
Uname: Linux 5.8.0-25-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu50
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.455
Date: Sat Nov 7 17:17:37 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
RebootRequiredPkgs:
 linux-image-5.8.0-25-generic
 linux-base
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)