Hi
As a former employee, I can vouch for all of my colleagues past and present insomuch as they don't make "shady" comments.
It's great that you love Illustrator and also that you're keen on Ubuntu—completely understand why, too. The most likely reason for there being no Ubuntu offering or support is that the numbers probably don't make it worthwhile. There simply aren't enough people wanting to use the platform to make it commercially viable—you'd need more engineers, more quality assurance, more support, etc. and all of that costs money—a lot of money.
Please pardon me for this, but people often forget that Adobe is a business, and they are duty-bound to make sensible business decisions with the revenue the company generates and the investnents made in it. That is also part of the problem with getting a response from active staff beyond something like "that is not our focus at the current time" which I'm hazarding a guess at meets your definition of "shady".
You'd probably find enthusiastic Ubuntu users in the Adobe workforce (using it for other tasks or personal projects) who would love to see Illustrator on the platform but also know that at the moment it's not likely to happen—at least until they are joined by tens of thousands of other users demanding the same thing.
Hope that helps you to understand, and who knows, one day that could happen—but it's in the Ubuntu community that you need to be recruiting support, maybe.
🙂
p.s.
You could always try asking the team directly by creating a request on uservoice: https://illustrator.uservoice.com/forums/333657-illustrator-feature-requests
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