Comment 3 for bug 242111

Here are some more details.

I followed the procedure outlined on
https://help.ubuntu.com/community/HardyUpgrades/Kubuntu for online
upgrading. I am not certain what the name of the invoked package is.
Adept Manager invokes it. The window shown in step 9 of that page shows
the window that is active until the phone line flakes out. In my case,
this step takes about a week, which would be a rather large cup of
coffee.

This appears to be "normal operation" for the upgrade installer. In
other words, it is apparently supposed to abort when the phone
disconnects. You could duplicate the sequence of events on any machine
that is not upgraded to 8.04. Just follow the instructions on that page
until you reach step 9, then disconnect from the Net some how. The
upgrade installer will probably abort for you as well.

My point is that there should be a "resume" button available to click after the connection is restored.