Wifi Ubuntu slow? Here's the solution!

A couple of days my Linux distribution Ubuntu gave me some hassle with the wifi being too slow.

So I squeezed a little in front of the terminal and I found the solution to the problem.

The problem is the power saving mode that Ubuntu requires wifi cards or keys, blocking happens on some devices, so yes there is the energy savings but do not be so much more to go.

Solution:

To determine the problem I did this:

iwconfig
It seems to me this:
pclinux@pclinux-desktop:~$ iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     IEEE 802.11bg  ESSID:”Sitecomxxxxx” 
          Mode:Managed  Frequency:2.412 GHz  Access Point: 00:0x:xx:xx:xx:xx 
          Bit Rate=54 Mb/s   Tx-Power=20 dBm  
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=69/70  Signal level=-41 dBm 
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0
Reading the Line Power Management on a beautiful read.

So now we have to turn off with:
sudo iwconfig wlan0 power off
If you notice that the speed increases, and then you definitely want to configure it:
sudo gedit /etc/rc.local
It opens the text editor and you have to insert the line
iwconfig wlan0 power off
before exit 0. Then save and exit. The next restart PC everything works properly.
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