Problems with WI-FI on Ubuntu 14.04 (HP 250 g4)

Hello everybody,

Since I installed Ubuntu 14.04 on my new HP 250 g4 laptop I've been experiencing random wi-fi signal dropouts (pages seem to load forever even though the wifi icon shows that I'm coected). I'm also frequently asked for wi-fi password.

The same goes for Linux Mint 17.02 which is installed as a second OS on the same laptop.

What's interesting, my wife has got Ubuntu 14.04 installed on her netbook (Samsung N150 Plus) and it runs flawlessly. (I've tried to compare wireless-scripts on our both machines but I couldn't find anything different that could possibly explain my problem).

I also noticed that it is common problem for this particular Ubuntu distribution but going through countless number of threads and not being able to find solution I finally decided to ask professionals for help with this because, to be honest, it's getting quite unbearable.

I'm also attaching wireless-info.txt.

Thank you in advance