Ubuntu 19.04: Install LXDE for desktop environment

The following command will install LXDE.

$ sudo apt install -y lubuntu-desktop
<snip>
check for a default display manager.

  1. gdm3  2. sddm

Default display manager: sddm
<snip>
$ sudo reboot

The following makes selecting display manager be automated.

#!/bin/sh -e

unset TERM
sudo apt install -y expect
cat <<EOF | expect
set timeout -1
spawn sudo apt install -y lubuntu-desktop
expect "Default display manager: "
send "sddm\n"
expect eof
EOF
sudo reboot

After reboot, sddm will be started. You can select other desktop environment.

LXDE is displayed.

The following command will uninstall LXDE.

#!/bin/sh -e

sudo apt remove -y lubuntu* lxqt* openbox sddm
sudo apt autoremove -y
sudo apt install --reinstall -y gdm3
sudo reboot