I think that you have connteced the hard drives in a wrong way: at the
first installation your Ubuntu hard drive was connected as slave device
on the primary IDE controller. You didn't attach your second disk as
master, but moved the old one from slave to master and attached the new
one as slave.
** Changed in: Ubuntu
Sourcepackagename: None = update-manager
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Distupgrade 5.10 to 6.06 (dapper) installs wrong grub configuration
https://launchpad.net/bugs/65905
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