Can't install boot loader on fat32

[CrazySky]

I want to create live CD from iso on fat32 fs. When I doing it, near 50% I must enter admin password. When I done this, I have the error that boot loader can't install.

Please fix this.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: usb-creator-common 0.2.56.3ubuntu0.2
ProcVersionSignature: Ubuntu 3.19.0-49.55~14.04.1-generic 3.19.8-ckt12
Uname: Linux 3.19.0-49-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Jan 31 07:15:22 2016
InstallationDate: Installed on 2016-01-29 (1 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: usb-creator
UDisksDump: Error: [Errno 2] Нет такого файла или каталога: 'udisks'
UpgradeStatus: No upgrade log present (probably fresh install)