This is regarding free software:
A license is very different from a EULA. The software on your computer starts out under the normal (default, in some countries) copyright by the authors. Only then do you get special permission to copy and re-distribute the software under the terms of the GPL. This does not restrict your use of the software, nor does it put any special onus on you to comply with some arbitrary terms. It is not a contract.
Think of the GPL as an agreement of the terms of re-distribution; you are granted license to deal with the software in ways normally prohibited by copyright law, given you agree to some terms.
A EULA restricts your use of the software, it has nothing to do with simple copyright. The EULA says, you may use this software, but not in any way you like. It restricts you further than copyright or trademark law could. Free software doesn't have that kind of restrictions, therefore you don't have to agree to any contract.
Ok, first of all Ubuntu is free (as freedom) and by now free (as beer). From the business page:
No hidden costs, no lock-in
Looking to escape the cycle of endless Windows upgrades? Now, there's a real alternative. No licence fees and no licence tracking overhead. With Ubuntu, you can scale your desktop infrastructure while keeping your cost down. You only pay for the level of support you need.
Download now for free ›
What this means, that the support should be supplied by yourself and the community around Ubuntu. Of course, if you have a emergency, don't expect fast response of the community, as we (the community) are all volunteers and not paid employee. That said, Canonical offers paid support for enterprises:
Buy professional support services
Canonical’s support engineers understand how important your IT systems are. Support with our systems management tool Landscape, is available to suit all levels of demand.
If this is what you are asking about then be my guest into contacting Canonical Ltd.
This site is not managed by Canonical Ltd. in any manner as you can read in our meta question:
Canonical gave permission for Stack Overflow to use the Ubuntu trademark and logo for Ask Ubuntu. A Canonical employee also assisted in the site's new design to help meet the Ubuntu Brand Guidlines.
Beyond that Canonical has made no public announcements relating to Ask Ubuntu. (So we must assume that the site is not officially endorsed by or related to Canonical).
(Note: There are Canonical employees that are members of the Ask Ubuntu community.)
That said, I hope you can get a idea where is what you are looking for.
Best Answer
Yes. Simply put Ubuntu is open source and free for anyone to use, including commercial use. Nice, huh!?
However looking at it more closely, you see that Ubuntu consists of a lot of individual packages and each can have its own license. That's important to keep in mind about redistributing software as not all software in all repositories is fully FOSS. See also my answer to Why are some programs in the Ubuntu Software Center not open source?.
I suggest you to read up on Ubuntu Licensing.