The ltmodem driver is available in Mepis, you just have to install it with Synaptic.
For the record, most people who compare Mepis and Kubuntu head to head usually like Mepis more. I've used both and can say the same. Of course, if you like Kubuntu, then more power to ya.
Right now, I have Mepis 6 on my office computer, as well as my laptop, which is fully configured for network, wireless, and dialup. Pretty cool.
I may give Mepis another try. Thanks.