Does anyone know if this works with ubuntu 14.04?

No! The "real" TP-WN725N will, but these (thought advertised as a WN725N) are "NOT" the WN725N, but are made by Archer, and they don't work with LINUX, Ubuntu or LINUX Mint. If you get a real TP-WN725N and plug it in, it will work right out of the box!!

What is this for? Why would one need it if their laptop already does wifi?

I'm about 5 years behind this question and the comments :), but I can tell you that I have a 17.5" Acer 1TB laptop that is less than 18 months old, and I called to have my wireless modem replaced by Xfinity because I was only getting download speeds of about 100 - 112 when my service is supposed to deliver 250+ Mbps. But when we checked my cell phone, it showed 300 Mbps from the same router, and the tech said that my wireless card in this laptop cannot accomodate more than the 112 Mbps I've been getting! He said he's seen brand new high-end laptops with wireless cards that can't detect of connect with a 5G network like Xfinity's is. Maybe because of cost and the fact that probably a large % of people don't have service faster that 100 Mbps or so. So I haven't tried one yet, but most are in the $16 - $19 range. The top-rated (4,300 reviews averaging 4+ stars) is about $37, and that gets you 1,600 Mbps!! Hope this helps....

Is this a good option for the Raspberry Pi B+ model?

If you want this to work with a raspberry pi, use this link. https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=62371&sid=8b78a7e30c4190fad8241b2

Will this work with Windows 10?

I have Windows 10 and received a version 1 (V1) adapter from Amazon. The TP-Link driver downloads do not offer a Windows 10 download for V1; however, there is a Windows 10 download for V2 and V3. I tried to install the V2 and V3 driver anyway, and although it installed, I only get 2-5Mbs down and about 4-5Mbs up. Same speeds for what Windows 10 auto detects and installs as Realtek RTL8188EU. I am in an adjacent room to my wireless router, through one wall and about 15 feet away. I have no idea why Amazon would still ship hardware that is not compatible with Windows 10. I’m only out a few bucks, so no big loss other than it being a hassle.

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TP-Link, WIFI, Wireless LAN, Sub-unit, 11n/11g/b, Dual mode compatible model TL-WN725N

TP-Link, WIFI, Wireless LAN, Sub-unit, 11n/11g/b, Dual mode compatible model TL-WN725N

Product ID: 728044403

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Details

Brand
TP-Link
Hardware Interface
USB
Color
Black
Compatible Devices
Desktop Laptop
Product Dimensions
19L x 15W x 7H
Data Link Protocol
IEEE 802.11b

💾Plug & Play USB 2.0

📶150Mbps high-speed Wi-Fi

🔒Advanced WPA2 encryption

Description

🚀 Tiny Adapter, Massive Wi-Fi Freedom

BUILT TO LAST - Backed by a 3-year warranty, this tiny adapter delivers reliable performance wherever you go.
ROCK SOLID SECURITY - Industry-leading WPA2/WPA-PSK encryption keeps your connection safe from prying eyes.
NANO SIZED POWERHOUSE - Ultra-compact design fits discreetly into any USB port without blocking adjacent slots.
EFFORTLESS COMPATIBILITY - Plug & Play support for Windows (XP to 10) and macOS ensures instant connectivity—no setup headaches.
SEAMLESS STREAMING GAMING - Enjoy lag-free video, voice, and online gaming with stable 150Mbps wireless speed.

The TP-Link TL-WN725N is a nano USB wireless adapter delivering up to 150Mbps speed with advanced WPA2 security. Its ultra-compact design fits seamlessly into USB 2.0 ports, offering plug-and-play compatibility across Windows and macOS. Perfect for professionals on the move, it ensures smooth streaming, gaming, and secure connections backed by a 3-year warranty.

Specifications

Brand	TP-Link
Manufacturer	TP-Link
Product Dimensions	1.85 x 1.47 x 0.69 cm; 1 g
Item model number	TL-WN725N
Is Discontinued By Manufacturer	No
Color	Black
Form Factor	adapter
Item dimensions W x H	19 x 15 x 7 mm
Processor Count	1
Wireless Type	802.11b
Number of USB 2.0 Ports	1
Wattage	150
Operating System	Linux, Windows 7, Windows 8, Windows XP
Are Batteries Included	No
Lithium Battery Energy Content	2 Kilowatt Hours
Lithium Battery Packaging	Batteries packed with equipment
Lithium Battery Weight	2 g
Item Weight	1 g