Searching for android tethering this was the closest thread I found...
I just went through some hoop-jumping exercises to get my HTC EVO 4G working as a USB modem. If that sort of thing has been working for everybody like right out of the box, I won't go into unnecessary details. It didn't seem all that easy for me till I got over a hurdle or two. One thing I had to do was download the Android SDK
http://dl.google.com/android/android-sdk_r16-linux.tgz and install it in my PC (PCLOS-GNOME) to get the use of the ADB command. Till executing that I didn't manage to get a usb wired connection listed as available in my Network Center although I could get the phone card listed as a usb drive. Though I had no trouble with installing it, it would be good if that SDK were in Synaptic. Of course, it's possible I went through extra trouble by accidentally skipping some easy step but once I'd taken care of several details I couldn't be happier. I didn't expect to be able to make and receive calls and do messages with my phone while it's got my desktop online at 3G speed.
[I swear I didn't see that other "mobile internet" thread when I posted this!]