I have pretty much the same problem as described in this question. I installed GNOME desktop environment on Ubuntu 16.04 using the command
sudo apt install ubuntu-gnome-desktop
But before that I've done this
sudo apt install gnome-shell
And now I want to go back to the Unity desktop environment. I changed default display manager back to the lightdm from gdm3 using sudo dpkg-reconfigure lightdm and choosing lightdm. After that I rebooted the system and saw that boot logo didn't change back to standard. On the login screen I chose Unity desktop environment (Ubuntu) but there are some strange things now:
- system font didn't change to what was in Unity
- I can't use the desktop (i.e. there are no files/folders and there is no response to mouse clicks on desktop at all
- after reboot the default desktop environment is still GNOME despite that I was choosing Unity every time (Ubuntu remembers my last choice but GNOME is the first in the list and there is "(default)" after its name).
- also there are some changes in context menus style.
I tried to do what is said in similar questions, namely:
- Setting theme (Appearance -> Theme) to
Ambiance. However it was already selected. ThoughAdwaitais default. - Removing
ubuntu-gnome-desktop Creating a config file
/etc/lightdm/lightdm.confwith the following content:[SeatDefaults] user-session=unity
There is a screentshot
