@Kulfy I've voted to reopen that. It's about how to upgrade from an EOL release, which is on-topic. 19.04 is recently no longer supported, but even if we don't regard the question as an XY problem and view it narrowly as asking how to get from 18.10 to 19.04, this is a reasonable approach as part of a multi-step upgrade to get to a supported release.
@Natty tp
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@Natty fp - Even before the edit this was an answer.
@Natty fp Before the edit, this was just a link, but the link text itself gave the actual solution -- the target of the link was the image that has been inlined in the edit.
This edit should be rejected. The goal of the question, both for the OP and for most people who should find it by searching, has nothing to do with the specific example of adding the arguments. I rejected it with the custom message:
> Summing the values seems to just be an example application of what the OP is asking about, which is how to treat some arguments as optional.
Solved it. It is just a matter of pointing to the right locations, then a clean update is still possible. This should not be "off topic", since it is not about supporting an EOL version, but about how to get to a supported version. If you want to know how, feel free to re-open the question. — ingo7724 hours ago
@EliahKagan (I should admit, it's possible to interpret this as meaning that they believe wrongly that 19.04 is still supported and that their specific goal is to get to 19.04 and stop for reasons other than their belief that it is non-EOL. But I think that's a big stretch.)
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