can't install Ubuntu 12 over ubuntu 11

[mrey]

I don't know more details.

Install from USB.
Instalation stop, and give the option to send this report.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.9.11
ProcVersionSignature: Ubuntu 3.2.0-11.19-generic-pae 3.2.1
Uname: Linux 3.2.0-11-generic-pae i686
ApportVersion: 1.91-0ubuntu1
Architecture: i386
CasperVersion: 1.301
Date: Sat Jan 28 01:35:58 2012
LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120127)
ProcEnviron:
 LANGUAGE=es_ES.UTF-8
 PATH=(custom, no user)
 LANG=es_ES.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Jan 28 00:35:01 ubuntu plugininstall.py: Traceback (most recent call last):
Jan 28 00:35:01 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1661, in <module>
Jan 28 00:35:01 ubuntu plugininstall.py: install.run()
Jan 28 00:35:01 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 56, in wrapper
Jan 28 00:35:01 ubuntu plugininstall.py: func(self)
Jan 28 00:35:01 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 155, in run
Jan 28 00:35:01 ubuntu plugininstall.py: self.configure_network()
Jan 28 00:35:01 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 385, in configure_network
Jan 28 00:35:01 ubuntu plugininstall.py: shutil.copy2(path, os.path.join(self.target, path[1:]))
Jan 28 00:35:01 ubuntu plugininstall.py: File "/usr/lib/python2.7/shutil.py", line 128, in copy2
Jan 28 00:35:01 ubuntu plugininstall.py: copyfile(src, dst)
Jan 28 00:35:01 ubuntu plugininstall.py: File "/usr/lib/python2.7/shutil.py", line 69, in copyfile
Jan 28 00:35:01 ubuntu plugininstall.py: raise Error("`%s` and `%s` are the same file" % (src, dst))
Jan 28 00:35:01 ubuntu plugininstall.py: Error: `/etc/resolv.conf` and `/target/etc/resolv.conf` are the same file
Jan 28 00:35:01 ubuntu plugininstall.py: