Upgrading to Ubuntu 8.04?

[Alfred]

Hi:

I've never done this before, that is upgrade Ubuntu over top of the
previous version. I bought the 6 DVD set, from www.thelinuxstore.ca due
to not having high speed. I Put the install disk in the drive to see
what was on it, if there were some docs to read, on how to do this.

A Dialogue Box came up and said  "Would you like to upgrade, and have
all the Email etc transferred to the new version". After upgrading with
all 190 upgrades for Ubuntu 7.10 on Dial up, I figured lets give the 8.04 Upgrade
a try. Well it said it was testing the Repositories, and then it
crashed. Trouble is when it tried this again, it had read the index
files on the first DVD, and I used Synaptic to load the data and DVD
names to use the DVD's as Repositories. When I tried to do the update
the Auto upgrade could not be found, and now there were 577 Updates in
Update, but very few of them were checked, and an error message said
that this could happen if the previous attempt was incomplete. Is there
some way to restore Updater to no updates, in other words get rid of
the 577 updates listed in it, so that I might be able to try this
again, that is do the upgrade of 7.10 to 8.04, over top of 7.10? Is
there some flaw in this Upgrade Software? Why does it crash? 

Alfred!