We have a rule that we don't support Ubuntu versions that are no longer supported by Canonical. However, there is no rule about software from other sources. And I really think there shouldn't be such a rule.
First of all, many tools simply don't have newer versions. So you have no choice but to try and use an older one. And yes, while some of those might ...
If the answer works on Debian but does not work on Ubuntu, then it is not an answer for Ubuntu and the scope of this site. If the solution works on Debian and Ubuntu then it's a valid answer. Otherwise it's not a valid answer and should not be posted.
This said, if the solution works on multiple distributions including Ubuntu then that is a valid answer ...
I don't see how this would be on topic. We only support official Ubuntu flavors, and this isn't one. The problem described seems to be an issue with the modified installer so I closed the question and suggested to the OP that they open an issue on the respin's github page instead.
In my honest opinion we should still support questions specific to currently supported release but asking for a software that ain't supported anymore. For example, Java 9 and 10 have reached their end of public support (Reference: Java version history - Wikipedia). But still we got a question about installing Java 9 on June 23, 2019. Some people indeed love ...
I have edited your answer to remove the emphasis on the fact that it's a bug. In my opinion, I think that is what caused the confusion.
There is no need to emphasise the fact that it's a bug, as your answer properly mentions a workaround which is a much more important part of the answer.
help/on-topic provides a clear definition which distros are on- and which are off-topic:
Questions that you may ask:
Using and administering official Ubuntu flavors: Ubuntu, Ubuntu Budgie, Ubuntu MATE, Kubuntu, Ubuntu Kylin, Lubuntu, Ubuntu Studio and Xubuntu.
Questions that you should avoid:
Linux Mint, Elementary OS, Backtrack, ...
First of all: thank you very much for reminding me to close my own question and answer as a bug.
Secondly, I'm voicing a personal opinion and this should not be taken as gospel.
Bugs are by their nature only temporary and as this discussion of 2012 points out, they need to be filed elsewhere.
As you've been around for 7 years already, I don't mind you:
Do we stop supporting external software?
No do not stop, with commentary.
The problem with old versions is that they clutter and confuse searches and explanations for current users of current software.
I'm of the opinion that asking questions for old things should be allowed, but only if they are specifically identified as such. I think truly solving the ...