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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. Though Adwaita is default.
  • Removing ubuntu-gnome-desktop

  • Creating a config file /etc/lightdm/lightdm.conf with the following content:

    [SeatDefaults]
user-session=unity

There is a screentshot

screenshot

Videonauth
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Jane Doe
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    Try reinstalling ubuntu-desktop with sudo apt install --reinstall ubuntu-desktop which is the base meta package for Unity DE. – Videonauth Nov 23 '17 at 23:48
  • @Videonauth unfortunately, I have already done sudo apt remove --purge gnome-shell and then I did sudo apt autoremove and this worked. Don't know if the last one did help but it freed good amount of memory and there were some packages concerning the GNOME such as ubuntu-gnome-wallpapers, ubuntu-gnome-default-settings and some else. However the boot logo remained the same. Though I find this logo pretty good and I'm not sure whether I want to change it. But I need to clarify. Will I lose my Unity settings after reinstalling Unity? – Jane Doe Nov 24 '17 at 08:02

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