We're missing a few important entries from the current closing process so I'm rewriting some of the current reasons. I've just asked the other mods to read over them but thought a bit of public input couldn't hurt either!
Most of these are based on what we've done in the past and on existing meta subjects about this.
This is not about Ubuntu. Questions about other Linux distributions can be asked on Unix & Linux, those about Windows on Super User, those about Apple products on Ask Different and generic programming questions on Stack Overflow.
You need to report this problem on Launchpad, Ubuntu's bug tracker. Bugs and problems with the development version of Ubuntu can't be fixed unless developers know about them and this is the wrong place.
This question is about an end of life Ubuntu release. These are no longer supported and are therefore off-topic here. To upgrade, see: How to install software or upgrade from old unsupported release?
This describes a problem that can't be reproduced that seemingly went away on its own or was only relevant to a very specific period of time. It's off-topic as it's unlikely to help future readers.
Of course there are four there and I'm still waiting to hear back to see if we can do that but let me know if you think any of these need improving and how you would do it. There is a character limit (and the first pretty close) so remember we can't fit a whole book in these things.
These are compatible with existing reasons so assuming I don't hear anything super-negative back, we'll try to get these through in the next couple of days. Hopefully along with an EOL entry too.