Even though the Raspberry Pi4 has a 64-bit processor Raspbian (the official OS by the Pi Foundation) by default is 32-bit for compatibility with other Pis. The benefits of running a 64-bit OS should be better performance (USB, Ethernet) and 64-bit applications. There is an experimental Pi4 64-bit Raspbian kernel in testing but what 64-bit LXQt images are available now?
Ubuntu 19.10 is now officially supported on the Raspberry Pi4 with a 64-bit (Ubuntu Server) image.
I downloaded the 64-bit image which is a minimal Ubuntu ARM Pi4 image and flashed it to a microSD card. On first log-in you are asked for a user and password. Enter “ubuntu” for the user and “ubuntu” again for the password and then enter a new password.
sudo apt-get upgrade
Ubuntu suggests installing the LXQt desktop using
sudo apt-get install lubuntu-desktop
The Lubuntu PPA which I originally used to install LXQt is now disabled (link removed).
Running uname -a shows that 64-bit Ubuntu is running on the Pi4.
I then experimented by installing Organizer from source.
You need to install the developer packages: build-essential, qt5-default, qtcreator, automake, checkinstall, cmake, libqt5svg5-dev, libqt5*-dev, qttools5-dev, libkf5plasma-dev, liblxqt0-dev etc. Then follow the install from source instructions from the Organizer github page:
I had to log in and out (to set up the database) to run Organizer (see screenshot below).
An alternative 64-bit ARM Raspberry Pi4 LXQt distro is that provided by Manjaro (Arch).
This is an image which can be directly flashed to a microSD card. The install process requires setting a user name, user password, root password, time zone, locale and host name. Once logged into Manjaro then upgrade using
sudo pacman -Syu
The yay AUR helper can be installed (see video below)