Krusader is a free and open source file manager for Linux and mainly for KDE but it also works for other desktops. It comes with two split panels, archive management,FTP file transfer, Mounted filesystem, in-build search, file viewer, file editor, content comparisons, batch file rename and more.
How to Install Krusader on Ubuntu Linux
Krusader is available from the official Ubuntu repository. In the terminal software run below commands one by one. It will install the latest version of Krusader file manager application on your Ubuntu Linux system.
sudo apt update
sudo apt install krusader