LAN Share is a cross platform local area network file transfer application, built using Qt GUI framework. It can be used to transfer a whole folder, one or more files, large or small immediatelly without any additional configuration.
You can download the Ubuntu package or linux AppImage or Windows executable from the release page. https://github.com/abdularis/LAN-Share/releases
download the latest version, for example
lanshare_1.2.1-1_amd64.deb then open a terminal, navigate to directory where the downloaded package is located and type
$ sudo dpkg -i ./lanshare_1.2.1-1_amd64.deb
simply download the AppImage and run it on all linux distribution
See the github release page or go to Softpedia