bios grub-install crash with "no space left" but there's plenty of it

[Daniele Dellafiore]

I can do a succesfull install on this very same system and drive with Ubuntu 20.04.
Since Ubuntu 20.10, and now with daily live 21.04, I get this error.

I *think* I do have a BIOS setup, not a UEFI, on a drive with existing Windows 10 and a Ubuntu 20.04.
When the BIOS starts and I select where to boot from, I get 2 options from the USB KEY: one is UEFI, the other is unspecified, which must be BIOS. I alwayse chose "BIOS".

Nothing much else to report for now.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: ubiquity 21.04.1
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: 2.20.11-0ubuntu51
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.455
Date: Thu Dec 3 16:09:55 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 21.04 "Hirsute Hippo" - Alpha amd64 (20201125)
RebootRequiredPkgs:
 linux-image-5.8.0-25-generic
 linux-base
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniele Dellafiore (ildella)]

This might be related https://bugs.launchpad.net/ubuntu-image/+bug/1748021