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Features
Polished µTorrent-like User Interface
Well-integrated and extensible Search Engine
Simultaneous search in most famous BitTorrent search sites
Per-category-specific search requests (e.g. Books, Music, Movies)
All Bittorrent extensions
DHT, Peer Exchange, Full encryption, Magnet/BitComet URIs, ...
Remote control through a Web user interface
Nearly identical to the regular UI, all in Ajax
Advanced control over trackers, peers and torrents
Torrents queueing and prioritizing
Torrent content selection and prioritizing
UPnP / NAT-PMP port forwarding support
Available in ~25 languages (Unicode support)
Torrent creation tool
Advanced RSS support with download filters (inc. regex)
Bandwidth scheduler
IP Filtering (eMule and PeerGuardian compatible)
IPv6 compliant
Sequential downloading (aka "Download in order")
Available on most platforms: Linux, Mac OS X, Windows, OS/2, FreeBSD
What is new in Version v3.1.4
FEATURE: Statistics dialog (Gelmir)
FEATURE: Tooltips explaining each peer's connection flags (sledgehammer999)
FEATURE: Win/Mac Check for program updates every 15min and allow the user to manually check for updates through the help menu. (sledgehammer999)
BUGFIX: Better dialog message for torrent delete confirmation (sledgehammer999)
BUGFIX: Fix resizing grip location. Closes #1146. (sledgehammer999)
BUGFIX: Lock toolbar in place. Closes #1144. (sledgehammer999)
BUGFIX: Second attempt at fixing saving settings on shutdown. (sledgehammer999)
BUGFIX: Sort labels in ‘Add new torrent' dialog. Closes #1150 #411. (sledgehammer999)
LINUX: Fix build under Ubuntu 13.10 (sledgehammer999)
LINUX: Make sleep and shutdown functions work on systemd's logind (Faheem Pervez)
Install qBittorrent v3.1.4 in ubuntu
Open the terminal and run the following commands
$ sudo add-apt-repository ppa:hydr0g3n/qbittorrent-stable
$ sudo apt-get update
$ sudo apt-get install qbittorrent
Screenshots
best torrent downloader for ubuntu and other systems.