Ok, so yesterday my ISP’s downtime caused some extra trouble.
Here’s what I did:
sudo apt-get dist-upgrade which installed a new linux and asked for a reboot. But then nothing else happened. Yeah, wrong idea!sudo do-release-upgrade which aborted with the same error./etc/apt/sources.list and replaced all occurrences of karmic with lucid and commented out the two lines from partners.sudo do-release-upgrade again. “Do you want to start the upgrade?” Yes!! “24 packages are going to be removed. 175 new packages are going to be installed. 1390 packages are going to be upgraded.“ Sounds about right! “You have to download a total of 790M. This download will take about 1 hour 40 minutes with a 1Mbit DSL connection and about 1 day 6 hours with a 56k modem.“ Just do it!

sudo apt-get autoremove and removed 25 packages.I think I’m done?
alex@orientalibombus:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 10.04 LTS Release: 10.04 Codename: lucid
And I can already report a definite improvement. When the iBook awakens from sleep, I can reconnect to my wireless network. 
I uncommented the partner lines again, ran apt-get update and apt-get upgrade – there was nothing to install, and no error messages. Good!