There is only one desktop; LXQt.
The
Lubuntu session includes all the Lubuntu modifications/scripts to it, ie. it's LXQt plus.
The
LXQt Desktop session is a purer upstream version of the LXQt, ie. without the Lubuntu modifications that we document in our manual.
Thus the first two are both the LXQt desktop.
LXQt is a WM
agnostic desktop; and Lubuntu has chosen to use `
openbox` as it's WM. We've also given the end-user the option to use it without the LXQt desktop if they wish since it's installed; a WM needs to be installed for LXQt to operate.
They are variations of the Lubuntu system giving you more choice; but needing no more packages/space/RAM than if they weren't available.
LXQt uses `pcmanfm-qt` as it's file-manager, as it's super light & efficient on the LXQt desktop (
it's the program that actually draws & handles your desktop so it's already in memory, using it as a file-manager won't use anything beyond what's really needed to operate your system).
FYI: You say you know about the manual; but also note there are two copies of the manual offered; the
stable which is the the latest
stable release (ie. 21.04 currently), plus the
lts version which covers Lubuntu 20.04 LTS currently.
For the Lubuntu 20.04 LTS manual use
https://manual.lubuntu.me/lts/
It won't be efficient and will waste resources. It was included with Lubuntu releases up to Lubuntu 18.04 LTS, as it made sense then, but it doesn't with any release from 18.10 onwards.
Synaptic can be used yes, but it'll require your system to load & use multiple libraries that do the same thing, ie. Qt5
libs for the desktop & LXQt apps, and GTK3
libs just for `synaptic` to run. That's why Lubuntu comes with
Muon Package Manager (
it will use libraries/toolkits that are shared with the desktop itself).
if you've enough RAM - you can use whichever you prefer.
The same applies with Software Centre vs Discover. Kubuntu & the latest release(s) of Ubuntu Studio also use Discover & Muon, as it's more efficient sharing Qt5 toolkit/libraries that are used by the desktop itself. Again if you've loads of RAM, you can use whichever you prefer. FYI: KDE uses the same Qt5
libs as LXQt does.
The same applies with Featherpad; it shares the same Qt5 libs that are needed to operate your desktop, where as using `gedit` would mean you'd need to load additional libraries wasting RAM; not a problem if you've heaps, but leaving less for apps (eg. web browsers) which are better with more.
Fair enough - to me it's the same system, with just a different GUI (graphic user interface) that I as a user control; but an identical system underneath where it matters.
I consider this system a Ubuntu one; even though I'm using LXQt & Lubuntu currently. On my box I have the option to logout & switch to GNOME (Ubuntu), or Xfce (Xubuntu) when I log back in, but I'm strange I guess (
don't mind bloating my system for the days when I want something different to my usual Lubuntu/LXQt system).
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