ubuntu installation

[Herivaldo]

Error at the end of installation on Dell inspiron mini 10.1 inches 160GB.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubiquity 2.18.7
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic i686
ApportVersion: 2.14.1-0ubuntu3
Architecture: i386
CasperVersion: 1.340
Date: Sun Jun 22 19:32:02 2014
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140417)
ProcEnviron:
 LANGUAGE=pt_BR.UTF-8
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pt_BR.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Jun 22 22:31:19 ubuntu /plugininstall.py: Traceback (most recent call last):
Jun 22 22:31:19 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1770, in <module>
Jun 22 22:31:19 ubuntu /plugininstall.py: install.run()
Jun 22 22:31:19 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 78, in wrapper
Jun 22 22:31:19 ubuntu /plugininstall.py: func(self)
Jun 22 22:31:19 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 202, in run
Jun 22 22:31:19 ubuntu /plugininstall.py: self.configure_apt()
Jun 22 22:31:19 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 623, in configure_apt
Jun 22 22:31:19 ubuntu /plugininstall.py: os.mkdir(target_cdrom)
Jun 22 22:31:19 ubuntu /plugininstall.py: OSError: [Errno 30] Sistema de arquivos somente para leitura: '/target/cdrom'
Jun 22 22:31:19 ubuntu /plugininstall.py: