Desktop environment

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Selection of desktop environment

echo $DESKTOP_SESSION

On Ubuntu, it returns

  1. 'ubuntu' gnome 3+unity
  2. 'mate' ubuntu Mate on Odroid xu4
  3. 'default' on Debian 8.0
  4. 'LXDE' on Debian's BBB, 'LXDE-pi' on Raspbian
  5. 'Lubuntu' on UDOObuntu 2

Unity (dead)

Unity is the default user interface beginning April 2011, with Ubuntu 11.04 according to the wikipedia. GNOME replaced Unity in Ubuntu 18.04.

GNOME

GNOME 3 is a default Ubuntu 18.04 desktop environment. Ubuntu GNOME (GNOME 3). The build-in screensaver is a digital clock showing the current time & date. Cool! This seems to be a new feature in GNOME 3.6 optimized for touch screen devices. See this and this.

UbuntuGnome1404.png UbuntuGnome1404b.png

Note that we can install the gnome desktop by using the command line. It will keep the current wallpaper. The clock in screensaver will not be shown until we shake the mouse or keyboard. 

sudo apt-get install gnome-shell
# Choose 'gdm' (Gnome Desktop Manager) as the display manager instead of 'lightdm' the Ubuntu's default
#    when it is configuring gdm as only GDM offers GNOME-specific features such as lock-screen notifications.
# See the screenshot at 
#    https://ideasnet.wordpress.com/2013/05/11/ides-desktop-how-to-replace-unity-with-gnome-3-8-in-ubuntu-13-04-desktop-edition/
# If messed up, run "sudo dpkg-reconfigure gdm"
sudo apt-get install ubuntu-gnome-desktop

If the lock screen does not work, use Settings > Brightness and Lock, or use the command line 

gsettings set org.gnome.desktop.lockdown disable-lock-screen 'false'

If the screensaver is not working, try 

sudo apt-get install gnome-screensaver

In my case, the screen turns off (black). But if we wake the PC up, the time and date screen shows up.

Some differences (inconvenience): 1. No maximize, minimize windows buttons 2. Have to click 'Activities' button (or 'Windows' key) to switch applications. These complains also appeared in other review.

How To Customize The GNOME 3 Desktop? w/ keyboard shortcuts.

GNOME shell

KDE

Kubuntu

Xfce

Xfce Explained: A Look at One of Linux’s Speediest Desktops "Xfce doesn’t support HiDPI, which can be a deal breaker on newer machines. Even on a laptop with a 1920 x 1080 screen resolution, I find Xfce’s interface and windows to be absolutely tiny."

Xubuntu. The response is quicker when I compare the speed by clicking the top-left icon (app menu) in Xfce and Acitvities button in ubuntu-GNOME. This is tested when both Xubuntu and ubuntu-GNOME are installed in VirtualBox. 

# Note the sources.list should contain 'universe' repositories.
# https://help.ubuntu.com/community/Repositories/Ubuntu
#
# Install XFCE alone, without Xubuntu, with this command:
sudo apt-get install xfce4
# Install the entire Xubuntu package, which includes a full suite of software and a lot of improvements:
sudo apt-get install xubuntu-desktop
#
# Note that installed terminal is XTerm and UXTerm which looks awful. We will want 
# xfce4-terminal, a modern, lightweight and low memory cost terminal emulator for X11, 
# which was included in the Xubuntu desktop.
sudo apt-get install xfce4-terminal

The default display manager (used e.g. log in screen) can be found by 

cat /etc/X11/default-display-manager

To install lightdm display manager 

sudo apt-get install lightdm

After running the above command, I found 1. a GUI login screen came out, but login failed (my case). Use Ctrl+Alt+F1 to switch to the command line approach. 2. startx failed.

LXDE

Lubuntu, LXLE and LXQt. LXDE is the default desktop environment for Raspbian, LXLE, BBB, and Lubuntu.

The default browser in LXLE is SeaMonkey (Debian Jessie has Iceweasel which is even similar to Firefox; see Odroid). In the Internet category, it also includes FireFTP (SeaMonkey extension), Transmission, Gitso (VNC), uGet. In the Sound/Video category, it includes Arista transcoder, Audacity, Guaydadeque Music Player, guncviewer, Pithos, RecordMyDesktop, Videos/Totem. Gedit, GParted, KeepassX and LibreOffice are standard. There is also a Games category.

The LXLE LS version provides several business apps to anyone on the network.

LXQt is the Qt port and the upcoming version of LXDE, the Lightweight Desktop Environment.

The download links (if we want to skip answering the question) are https://sourceforge.net/projects/lxle/files/Final/OS/.

LXLE key features

One cool thing in lxle is the random wallpaper. On regular Ubuntu, we can install a wallpaper changer program - Wallch or Variety. See also OMGUBUNTU.

Variety pref.png

In Lxle, the random wallpaper is done through a simple command 

dash -c 'pcmanfm -w "$(find ~/Pictures/Wallpapers -type f | shuf -n1)"'

A list of keyboard shortcuts for Lubuntu.

The file manager in LXLE is PCManFM (not to confuse with the package manager pacman in ArchLinux). It does not support drag and drop to copy a file name to a terminal but it can execute a file in a terminal by PCManFM -> Tools -> Run a Command in Current Folder.

Cinnamon

Linux Mint. A GTK+-based desktop environment. Note that Mint releases only LTS versions (5 years support as Ubuntu).

To check the desktop environment, use echo $DESKTOP_SESSION. To check the cinnamon version, use cinnamon --version.

Note

  1. To change to other workspace, use Ctrl + Alt + Up or Alt + F1 keybind to enter Expo mode and then select one. To directly switch to the next workspace, use Ctrl + Alt + Right/Left arrow key.
  2. To change the title bar color from gray to black follow this instruction. Go to Preferences -> Themes and click 'Add/Remove desktop themes'. Type the keyword 'nightfall' and install the theme. Close the 'Themes' window and open it again. Click 'Windows borders' and select 'nightfall'.
  3. Mint has its own package update manager. Click Menu > Administration > Update Manager. Security updates are level 5. Kernel updates are level 4/5. See their meaning on the official user's guide.
    • Level 1 and Level 2 updates are risk-free and you should always apply them. Level 3 updates “should be safe” but, although we recommend you take them, make sure you look over them on the list of updates.
    • Level 4 is "Unsafe packages". It could potentially affect the stability of the system". Level 5 is "Dangerous packages".
  4. We don't have to install Linux Mint in order to get cinnamon desktop. How To Install Cinnamon 3.0 In Ubuntu 16.04 Or 15.10 Via PPA
  5. this Cinnamon desktop has a digital clock as a screen saver while the MATE desktop only has a black screen as a screen saver. I still get the digital clock as a screen saver when I install cinnamon desktop on top of regular Ubuntu.
  6. One time I accidentally select 400+ archive file and choose to "Open With Archive Manager". This make my desktop freeze. The solution is to remotely ssh to the machine to kill all instances of Archive Manager and refresh the Cinnamon desktop. 
    killall file-roller
pkill -HUP -f "cinnamon --replace"

MintCinnamonSS.png

To install a cinnamon desktop on Ubuntu 

sudo add-apt-repository ppa:embrosyn/cinnamon
sudo apt update
sudo apt install cinnamon-desktop-environment lightdm

MATE

Ubuntu Mate. The MATE Desktop Environment is the continuation of GNOME 2. 

odroid@odroid:~/$ cat /etc/X11/default-display-manager
/usr/sbin/lightdm

Pantheon

Elementary OS & wikipedia. I cannot make the Chinese input to work (I can install ibus-chewing but cannot switch input methods?).

(Loki release 0.4.1, May 2017) No screensaver. The default browser is Epiphany:( The default apps on the launcher are not useful. No office applications. df -h shows 3.7GB space is used.

Automatic login

How to enable Automatic Login on Ubuntu 18.04 Bionic Beaver Linux

How to Refresh Your Linux Desktop Without Rebooting

http://www.makeuseof.com/tag/refresh-linux-desktop-without-rebooting/

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