As long as Lightsail doesn't limit the capabilities of their VPS, I don't see why it would be any different from a normal install on Ubuntu.
yeah, it's identical. LightSail ends up being exactly like a DO or Vultr.
It depends on what you are looking for. There is a plugin to connect wordpress or ghost to NodeBB. https://community.nodebb.org/topic/810/nodebb-plugin-blog-comments-blog-commenting-engine-ghost-wordpress-widget/2
I have a feeling you mean something more like the IP Blog system, which adds user blogs to the forum.
You will have to be clear on what you are actually after. Blog plugin is not very descriptive.
@Jenkler that should be a massive plugin or acore feature.
I was thinking on starting a similar plugin when i have some time. Something based on marking some threads as blog entries or news, and display them in homepage into a widget to simulate some sort of blog-like functionality.
The comment system and visualization would be the same as a forum, in fact it would only be a post but flagged as displayable in the widget, so all mantains the same, except the flag.
Is that similar to what you want?
A chosen category as a blog with separate styling to differentiate it from a normal topic (perhaps with its own "header" image field) , and placing the author avatar and name elsewhere with the option to reverse "replies" in it so the newest comments comes first (or not).
That said, using Ghost with the comments plugin would give you all of that now, and it runs on NodeJS. But it would be a useful solution for many.