Konqueror is a free and open source file manager and web browser for Linux. It is a kde project but you can use it on all other Linux desktops. It also comes with embedded applications to preview files and pictures. It comes with KHTML/KDEWebKit web rendering engines, ftp and sftp servers support and use as FTP-client, you can also extend its features using plugins.
Install Konqueror on Ubuntu Linux
Konqueror is available from the official Ubuntu repository. In the terminal software run below commands one by one to install the latest version of Konqueror file manager application on your Ubuntu Linux system.
sudo apt update
sudo apt install konqueror