When I run installation of Ubuntu 12.04 LTS on my notebook Toshiba Intel core i5, 6mb RAM, 500 Gb.
I receive a message of
"no root file system is defined"
What can I do?
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It appears to me you are not selecting a proper mount point during the installation for root ( "/" ).
Make sure you select and assign all the mountpoints according to your needs.
A mount point is a directory (typically an empty one) in the currently accessible filesystem on which an additional filesystem is mounted (i.e., logically attached).
Quote from http://www.linfo.org/mount_point.html