Transmission is a fast, easy, free bittorrent client. This tutorial will teach you how to install the latest version in Ubuntu.
Linux Kernel 5.6 includes WireGuard support to replace OpenVPN, USB4 as an open implementation of the Thunderbolt specification, file-system improvements, espcially to F2FS data compression using LZO/LZ4 algorithms, and a fix for 2K38 18-years early. Hardware improvements are AMD Zen power and temperature reporting, and open-source drivers for Nvidia RTX 2xxx
Linux Kernel 4.16 includes VirtualBox Guest drivers for better VirtualBox performance out-of-the-box, file-system improvements, espcially to XFS, better multoi-display support on AMD GPUs, and ongoing Spectre/Meltdown mitigation.