rocketfuel-setup could not retrieve key

I'd like to try out a in-house launchpad at some point,
so I thought I should get it.
But for some reason the rocketfuel-setup couldn't download
the keys it wanted for the dependencies it needed to apt-get:

Retrieving key 0A5174AF.
gpg: requesting key 0A5174AF from hkp server keyserver.ubuntu.com
gpgkeys: key 0A5174AF not found on keyserver
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
Could not retrieve key 0A5174AF.

So after mucking around trying to tell it to use my proxy,
I just commented out the relevant exit 1 lines.
This worked great, I just got prompted to confirm I want to install these packages.
I suppose the better solution would have been to try harder to manually install
the keys, but I didn't want to think about it too much.

how to use apt-key so apt-get stops complaining

Use the last 8 digits apt-get gives you when it complains about keys eg.:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 5ADC2037

(I'm just pasting it here so I can find it again)

xfce=a new lease of life for my not-so-old laptop.

Yes kde4 made my 64bit, 4GB mem, Core2 Duo 2.4GHz (kubuntu 9.04) laptop cry and die on me. For some reason it made X use a lot more memory than I would like.
So a couple of weeks ago I tried out xfce and I can be productive on it now. Although I miss a lot of features, at least I'm not running out of memory so easily and it does not crash so often anymore.
It may not strictly be Kde's fault, but by experimentation I found that xfce is better for me at the moment.