I don't disagree, but the installation instructions for both OH 1 and OH 2 and there are even special instructions for installation on the Raspberry Pi are actually fairly well documented. But OP didn't have trouble installing OH, he/she had a fundamental misunderstanding about where the border is between OH and the OS.
@ThomDietrich is currently working out a documentation scheme with stickies in the forum. I'm not certain this is exactly what he is after given how much documentation already exists for installation in the official docs, but the conversation is worth having.
I completely understand the frustrations newcomers have when coming to an application as complex as openHAB but the developers and documenters have to draw the line somewhere and I'm firmly of the opinion that Linux fundamentals is beyond the scope of what should be documented in OH. Particularly since OH runs perfectly well on pretty much all the other platforms.
I do think perhaps some guidance and/or documented prerequisites (as in what knowledge users are assumed to possess) might be in order. Also, @ThomDietrich's work with openHABian will go a long way towards making the Pi (and soon other platforms) easier to get up and running for the new user.
But there will always be a few bindings/actions which will require a greater amount of knowledge to use effectively no matter how easy openHAB becomes to install and configure. I'd put Exec, Serial, TCP/UDP, GPIO, and HTTP bindings in that category for sure. All things considered, I would not recommend any of these bindings to inexperienced users.
That is a challenge that I've not figured out a way to address. It is a clear problem because there are tons and tons of tutorials out there written by third parties of various vintages and almost none of them use apt-get. Even such authoritative sources as Makezine follow a "manual" wget based installation process (I posted a comment on that posting).
I'm not convinced a sticky will help this problem. There are (as linked above) well written instructions in the official docs for installation and people are not checking those before installing. Because these third party instructions use wget, most of these users don't even visit the openhab website or this forum until after they installed and are having problems.
I agree, I should do this more. But it isn't always clear who the newbies are (though in this case it is clear) and being too basic and basic in our first response can come across as condescending as well. Its a hard balance to reach. Though once the openHAB 2 documents are a bit more complete I do have planned in the back of my mind a troubleshooting document or wizard or the like to walk new users through the basic troubleshooting steps (is it running? are there errors in the log? is the addon installed? ...).
I actually think the number of active helpers on this forum is pretty high when compared to other forums. Most have their specialties (e.g. chris jumps on zwave questions, watou is great with mqtt, and several folks help out newbie type questions, etc). Compared to most forums for OS projects of this nature, that is a really high level of participation. Most have only one or two active helpers. Is the OH forum as helpful as it could be? Probably not. But this is THE challenge with 100% volunteer projects like this.
Care to post how you got it to work as a tutorial? I don't have an iPhone in the house (and the script doesn't work on Android, I tried) so I can't get any further than what I've already posted here. @ThomDietrich is leading an effort to get a bunch of tutorials like this into the forum under the Tutorials and Examples tag and this is a perfect candidate to get a good and complete example written up.