Useful procedures on Ubuntu

Enable root ssh login on Ubuntu 14.04

edit /etc/ssh/sshd_config to make sure the following:

     PermitRootLogin yes

if want to allow password log in, then add the following line as well 

     PasswordAuthentication yes

for root user, there must be a password generated for root.  

Restart the ssh service

     service ssh restart 

Change em1 to eth0

sudo apt-get remove biosdevname

sudo update-initramfs -u 

on ubuntu 15.10 do the following:

edit /etc/default/grub change

   GRUB_CMDLINE_LINUX_DEFAULT="net.ifnames=0" 

run this command:

   grub-mkconfig -o /boot/grub/grub.cfg

on ubuntu 16.04 do the following:

edit /etc/default/grub change

   GRUB_CMDLINE_LINUX="net.ifnames=0"

run this command: 

   grub-mkconfig -o /boot/grub/grub.cfg 

reboot the system 

Kill processes in Ubuntu by name

kill $(pgrep someprogram)

killall -v someprogram

pkill someprogram

kill `ps -ef | grep someprogram | grep -v grep | awk ‘{print $2}’`