ubuntu 12.10 error fresh installing process ubiquity

[Jorge Manuel Pinho]

Ubuntu 12.10 fresh install. Blocks during the installation process and returns a message saying that there is a bug on ubiquity. After that it is not possible to install. It happens all the time.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: ubiquity 2.11.23 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 3.5.0-11.11-generic 3.5.2
Uname: Linux 3.5.0-11-generic x86_64
ApportVersion: 2.5.1-0ubuntu2
Architecture: amd64
CasperVersion: 1.321
Date: Sat Aug 25 12:48:11 2012
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120825)
ProcEnviron:
 LANGUAGE=pt_PT.UTF-8
 TERM=linux
 PATH=(custom, no user)
 LANG=pt_PT.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Blair Chasteen (darkstormyrain)]

did you format the partitions you were installing to or was the previous install (working or not) directories erased?

I noticed similar outputs from ubiquity when I erased the old install when re-installing.

[ Home directory /home/ubuntu not ours.
Error opening file for reading: Permissão negada

** (ubiquity:2814): CRITICAL **: unable to create directory '/root/.cache/dconf': Permissão negada. dconf will not work properly. ]

After making a new partition table and partitions + formatting them before installing fresh the above errors never happened.