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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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