how to update my ubuntu 5.10 to 6.06 from the hard disk?

[zhihang wang]

I installed 5.10 from CDROM, and now I download the 6.06 from the web and I
want to update my 5.10.
When I mount the iso file to a directory and use the dselect to change the
source type, an error occures.
It says: Can't find the install package *.deb file from ..i386/. I find that
there is not a *.deb file in that directory. Only the Packages file and a
Packages.gz file.
Why?
The md5 num is correct. So the iso file is not corrupt. But How can I finish
updating my 5.10 from Harddisk?


-- 
Best Regards
zhihang wang
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