Upgrade Jaunty -> Karmic stalls at 99% download

[Lysi]

Hi,
I have a rather strange error.
I run the upgrade from jaunty 9.04 to karmic in kubuntu. It started downloading all files and reached 99% and then stalls now for about 6 hours.
It didn't proceed to "Aktualisierungen werden installiert" (meaning: new stuff is getting installed).

So what can I do? Is there a logfile or something which would help?

Thanks,
Lysi