during installation it was not possible to install grub

[Pierpaolo Collarin]

At the end of the installation, a fatal error occurred in installing grub in the partition destination. Any change in the destinatione failed as well.
Partitions were ext4.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.10.20
ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
Uname: Linux 3.2.0-29-generic x86_64
ApportVersion: 2.0.1-0ubuntu12
Architecture: amd64
CasperVersion: 1.315
Date: Sat Oct 13 21:50:39 2012
InstallCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
ProcEnviron:
 LANGUAGE=it_IT.UTF-8
 TERM=linux
 PATH=(custom, no user)
 LANG=it_IT.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)