Install 4pane by entering the following commands in the terminal
Update package repositories and get latest package information.
sudo apt update -y
Install the packages and dependencies with -y flag.
sudo apt install -y 4pane
Now that you have your 4pane installed
Package Description: four-pane detailed-list file manager
OS: Ubuntu 20.04 LTS Focal Fossa
Dependent Packages (you may have to install the packages below if it is not installed automatically or is not available on your computer) :
Development files for Qt4Pas
Qt4 interface bindings for Pascal
Xfce4 panel libraries (GTK3 variant)
four-pane detailed-list file manager
automated theorem prover for SMT problems (parser runtime)