How to make VirtualBox use GPU or fix slow performance problems with ubuntu 12.04 ,12.10,13.04,13.10, 14.10

                                                               step 1

                                  sudo apt-get install linux-headers-$(uname -r)            

                                                               step 2
                    sudo apt-get install build-essential 

step 3

cd /media/

step 4

cd /VBOXADDITIONS_4.3.0_89900/

(in your case  there may be other   numbers)

step 5

then just type 

sudo . /VBoxLinuxAdditions.run

and hit  Enter

step 6

sudo nano /etc/modules

step 7

add       vboxvideo

Ctrl +x  then type y

step 8

/usr/lib/nux/unity_support_test -p

step 9

check if all is ok

REBOOT your pc

UBUNTU 14.10  fri dec5 2014

-----------------------------------------------------------

step 10

If  system still very slow  last chance

step 11

click here 

step 12

choose GNOME CLASSIC (no effects)

the end.

/usr/lib/nux/unity_support_test -p

sudo apt-get install linux-headers-$(uname -r)

sudo apt-get install build-essential

cd /media/VBOXADDITIONS_4.3.0_899660

sudo nano /etc/modules

vboxvideo

reboot your pc

How to setup static ip address in debian or ubuntu desktop or ubuntu server UPDATED for ubuntu 16.04

                                                                 step 1
                                                       
                                                just check your interfaces
                                sudo ifconfig  or ifconfig (from root)

step 2

default DHCP(router gives out each time a new IP address)

step 3

backup your   network configuration file ( recommended ) 

step 4

just chek 

step 5

install arp-scan   (don't forget use sudo)    

step 6

use command      arp-scan -I eth0 -l

or

arp-scan --interface=eth0 --localnet

and

step 7

now you know which ip addresses on your LAN are occupied

step 8

check ip address of your default router 

step 9

results

step 10 

time to change your IP address

command    nano /etc/network/interfaces

step 11

   auto eth0

                     iface eth0  inet static

                      address 192.168.1.2  

                          netmask 255.255.255.0

                      gateway 192.168.1.1

                             broadcast 192.168.1.255

                                   nameservers 8.8.8.8  8.8.4.4

(number in red color need to be changed to the number you want)

to safe and exit nano text editor use command Ctrl+x and then press y

step 12 

(in case if you change your mind and want to use old settings)

just comment lines

you need to restart your system 

your choice

without living your desktop 

command     /etc/init.d/networking restart

or

you can do manually(just press restart button)  

the end for debian

step 13

this step  only for ubuntu desktop or server 

sudo nano /etc/network/interfaces

step 14

UBUNTU 16.04

How to make secure file transfer from remote host to your local host

                                                                                                                   step 1
                                                                                          scp  /root/Desktop/filename.png  root@192.168.1.2:root/Desktop

step 2 

connect over ssh to your server or remote host

step 3

change directory to  file you need 

cd /Documents/

step 4

if ssh not enabled  or disconnected 

use command on your local host 

(or enable ssh)

service ssh restart

192.168.8.21

step 5

scp lastrec root@192.168.1.2:/root/Desktop/datab

(don't forget use    sudo)

step 6

om my local host 192.168.1.2

step 7

on my remote server  192.168.1.21

 the end.

you have to be connected over ssh to remote host

 and  in your case possibly

scp  /home/john/file you want to   username@192.168.1.13:/home/adam/Desktop

                     

How to enable ssh connection on remote host

                                                              step 1
                                                                       

step 2

on remote host

etc/init.d/ssh start

step 3

on remote host
sudo sshd generate

step 4

make permanent on every start

                                                      update-rc.d ssh defaults  

step 5

check status
service ssh status

step 6 

(optional) on your host

sudo service ssh restart