Till now I was working with Ubuntu 16.04, with classic GNOME flashback (I don’t remember where did I install it from).
Now I moved finally to 20.04, and tried to install the same, but somehow it looks much less elegant to me.
While this is how it looks in 16.04:
This is how it looks after installing it on 20.04:

I wonder whether this is how it is, or should I install another package or something.
>Solution :
You have to try MATE as in Ubuntu MATE. Install it with
sudo apt update
sudo apt install ubuntu-mate-desktop^
then reboot, login to MATE session and enjoy classical traditional desktop without bells and whistles.
Customization is possible by running MATE Tweak after installation – you can switch Panel layout to Traditional layout (as in GNOME 2) –
or try more modern layouts which suite your needs.
Additional note:
- you can make a screenshot with opened context menus by running MATE Screenshot with timeout in interactive mode by
mate-screenshot -icommand. - you may want to read Ubuntu MATE Guide to know Ubuntu MATE system.
- you may want to read MATEwiki to know MATE desktop.
- you may want to talk with Ubuntu MATE Community on the corresponding site.
