Finally, I found something that actually does allow me to interact with a (relatively) modern Motorola phone just fine! It's called P2k Commander and there's a Linux version as well as a Windows version. Seemed perfect! I downloaded the source for p2kc 0.6 and got started. And it was pretty good, but there were some things I wanted to fix in the code . . . So, I did! (Got to love truly free software!) Also, I figured it could stand to be cleaned-up and packaged for Ubuntu. So, I did that, too!
If you'd like to try P2k Commander on Ubuntu, download this package. (If you're running the AMD64 architecture of Ubuntu, use this package instead, but if you're not sure, stick to the default i386 architecture package that will work best for almost all Ubuntu users out there.) Finally, if you're a developer interested in the package sources, you can find those here.
I might eventually create an Ubuntu repository for these packages, but I'm not to sure I can actually provide that, so we'll see . . . In the meantime, once you've downloaded the package, install it like so:
sudo dpkg -i p2kc_0.6-0ubuntu1_i386.debor:
sudo dpkg -i p2kc_0.6-0ubuntu1_amd64.debThen go to your Applications menu and select the P2kCommander launcher (which should be under "Accessories" or "Utilities" or something like that). You'll be asked to enter your password to gain administrative privileges.
After that, you'll need to connect your phone with a USB cable. And then you should be able to view, change, and copy files on the phone by selecting "P2k: /e" or one of the other "P2k" entries. So far, it's allowed me to add ringtones and other files to my phone with little trouble!!! It also allows me to download pictures off my phone and retreive audio files recorded on the phone (which are recorded as AMR files and can only be played with this app, so far as I know). This has opened up a lot of new uses for my phone to me!
I hope this helps someone else. And if you do like this app, show some appreciation to Sándor Ötvös AKA s5vi, who created P2kCommander in the first place.
Finally, if you're interested in the Windows version, you can get that at his site as well: http://www.el-co.hu/smf/.