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Recently, my apt-get updates started failing with:

W: GPG error: http://www.getautomatix.com edgy Release: 
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY CC919A31E23C5FC3
W: You may want to run apt-get update to correct these problems

This was easily fixed with:

$ gpg --keyserver subkeys.pgp.net --recv CC919A31E23C5FC3
gpg: requesting key E23C5FC3 from hkp server subkeys.pgp.net
gpg: key E23C5FC3: public key "Arnav Ghosh (Automatix Team Lead) " imported
gpg: Total number processed: 1
gpg:               imported: 1
$ gpg --export --armor E23C5FC3 | sudo apt-key add -
OK

Now, apt knows about the gpg public key for Automatix and doesn’t complain when I do sudo apt-get update.

How often is is that you come across a simple tweak to your configuration file (/etc/hosts in this case) that claims to give you a noticeable performance increase, and with no discernable drawback?

I was psyched to try this one out and then I realized that I already had my hostname in /etc/hosts.

On a side note, I’m looking forward to the Ubuntu Feisty release, which is coming up in a couple of weeks…

OnlyUbuntu: Performance tip for Ubuntu Edgy and Feisty

My Ubuntu box has always been networked via Ethernet, but lately I’ve been toying with the idea of moving the box and/or the wireless hardware to different rooms. Before doing that, I’d need to get it on the network via wireless.

I happened to have a Linksys WUSB54GC USB wireless adapter so I plugged it in and hoped that Ubuntu would magically discover it and set everything up for me. No such luck. The adapter was detected and I even ended up with new wireless interfaces – wlan0 and wmaster0, which seemed to be using the rt73usb kernel module. I attempted to configure them, but things just weren’t working. For one thing, when I did ifup on them, they attempted to get an address via DHCP, but they could not get one. I also noticed that when I tried to use iwlist to list the available channels, it came back saying that 0 channels were available.

I did a search and came upon this page. This page walks you through downloading the source code for a ralink-rt73 kernel module and building it with module-assistant. The page also provides a link to a .deb package that installs all the udev voodoo to recognize the adapter and load the kernel module. When everything is done and working, you plug in the adapter and an interface called rasusb0 is automatically created. The only problem I had was that I had to unload the rt73usb kernel module and then reinsert the adapter to get the kernel module to load and to get the rausb0 interface to be created. Once, I had the rasusb0 interface, it was pretty easy to set it up to get the wireless working. I entered the SSID and WEP key in the Ubuntu “Networking” panel and then went to the command-line to do a few finishing touches:

$ sudo iwconfig rausb0 channel 2
$ sudo ifdown eth0
$ sudo ifup rausb0
$ ping 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=3.54 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=1.65 ms

Voila!

Definitely not plug and play but not as hellish as I had imagined.