EDIT 25-01-2020
Since posting this answer, I have spent a few years being a moderator on both Ask Ubuntu and Unix & Linux. I now have a much better idea of what users here suggest for migration and am completely, 100%, adamantly against opening a migration path. It's just not worth it, there are vanishingly few questions that would be worth migrating and what the community tends to think is worth migrating is usually really, really bad questions that would not be welcome on U&L.
I'd like to chime in here as a regular on U&L. First of all, I have to agree with Oli that our crap threshold is much lower on U&L. We tend to be far more aggressive with closing questions than AU and we seem to feel more strongly about having quality questions. That said, there are many Qs I've seen here that have been closed but would have been welcome on U&L. Some random examples:
- https://askubuntu.com/q/11405/85695
- https://askubuntu.com/q/24017/85695
- How can I manually change the default web browser?
- https://askubuntu.com/q/251850/85695
- https://askubuntu.com/q/269909/85695
- https://askubuntu.com/q/40910/85695
All of the above would have been perfectly fine on U&L. While there are extremely few cases where a question would be considered off-topic on U&L and on-topic here, there seem to be many cases of the inverse.
The only reason I am wary of this idea is, as suggested already by Oli, that AU members don't seem to be as aware of the SE model as other SE communities and I am afraid that U&L might be inundated by crappy questions if this migration path were opened for non-mods.
On the other hand, U&L is much smaller than AU and we can deal with a good deal more questions than we are currently receiving. If the AU community were to be diligent in not migrating crap so that U&L does not become a dumping ground for the, admittedly very many, bad questions that are posted here, I would be in favor of this proposal.
In summary, I think I can speak for U&L when I say that we would welcome your good questions that are off topic here but not at the price of a slew of bad ones.
As @derobert suggested in the comment below, it might be a good idea to just try this for a week and see how it goes. Unless it is very hard to implement, that should give us an idea of whether this is worth it or not.
