As long as the known issues you're asking for are strictly Ubuntu related (the only thing I can think of is e.g. if the hardware is [well] supported), I think it is. It's about Ubuntu and it's a very specific question (i.e. it doesn't fall either into the off topic or into the too broad category). The reverse question indeed wouldn't instead (e.g. to ask on which laptops Ubuntu is supported: too broad, or whether Ubuntu will work "well" on such laptop: primarily opinion based).

As long as you're asking for objective and strictly Ubuntu dependant known issues (the only thing I can think of is if the hardware is supported), I think it is.

In that case the question would be both about Ubuntu and localized enough (i.e. it wouldn't fall either into the off topic or into the too broad category). 

The reverse question e.g. indeed wouldn't instead (e.g. to ask on which hardware Ubuntu is supported: too broad, or whether Ubuntu will work "well" on such hardware: primarily opinion based).

I don't know what people are going to do with your question, but I think it is. It's about Ubuntu and it's a very specific question (i.e. it doesn't fall either into the off topic or into the too broad category). The reverse question indeed wouldn't instead (e.g. to ask on which laptops Ubuntu is going to work: too broad).

As long as the known issues you're asking for are strictly Ubuntu related (the only thing I can think of is e.g. if the hardware is [well] supported), I think it is. It's about Ubuntu and it's a very specific question (i.e. it doesn't fall either into the off topic or into the too broad category). The reverse question indeed wouldn't instead (e.g. to ask on which laptops Ubuntu is supported: too broad, or whether Ubuntu will work "well" on such laptop: primarily opinion based).