What you read is wrong, and let me explain why.
a) In order to install anything 32bit on a 64bit distro, you first need to enable 32bits in apt, like so
sudo dpkg --add-architecture i386
sudo apt-get update
and then install something like so
sudo apt-get install mpv:i386
This will install the 32bit version of mpv from the repo, along with all its dependencies in 32bit. If the howto you read did not have the "--add-architecture" part, you probably did not install anything in 32bit, not only flash.
b) The package adobe-flashplugin is from canonical's partner repo, it contains both the npapi version (= flash for firefox and other browsers with less than 0.01% market share) and the ppapi version (= flash for chromium based browsers, like chromium, opera, vivaldi etc). Imho, this is the only right way to get flash on ubuntu and derivative distros, why? Because...
c) The package pepperflashplugin-nonfree is in fact a script that downloads the ppapi flash from adobe, extracts it and places it in the right place so that browsers can access it. Sounds good as an idea, but it has one major flaw.
The download url changes everytime there is a new version, so the script relies to an online file mentioning the version, and someone has to change that file from time to time. And he simply doesn't, making the script useless, or, as I have said before, poorly maintained rubbish. Remove it.
d) The package flashplugin-installer is script for the the npapi version of the above and it is poorly maintained too, for the same reason. Remove that one too.
Those logs are from my router/network firewall.
You simply need to log in as administrator and if equiped/program, check appropriate logs. In my case it's a combine log all events.
Check with your router internet site for instructions.