I have been using Verizon for years, Dialup, DSL, and now FIOS. I have never had any issues running Ubuntu (or any other distro) and getting access, provided I used the router they gave me during installation. I of course upgraded to a Linksys running DD_WRT but I could easily have stuck with the one they provided.
For broadband they don't really care what OS you have, as long as you are able to configure it for DHCP, but they will not guarantee it will work (as it is not officially supported) Each time the tech came out for the install, even though he has confused with the OS presented to him, all he asked for was a browser window so he could connect to and configure the router.
As long as the Linux boxes could DHCP an address from the router(which is configured for you) everything works well. The tech will even make certain WEP is enabled if you are provided with a wireless router.
I also used Comcast briefly, before they began their traffic shaping crusade soto speak, and even though I had no issues with them and Linux I can't recommend their service at all. It worked fine for a few months, then they sent out some kind of auto update to the cablespeed modems, and apparently my modem failed during its update process, effectively making it a brick on my desk. It took Comcast 33 days to send out a tech to fix it, I called Verizon on day 7 to install DSL and their tech was there on day 9.
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