Add swap
cat /proc/sys/vm/swappiness #shows current swap swapon -s #also shows current swap sudo gparted& #and create swap partition RAM*2 sudo mount -a #mount all unmounted sudo swapon -a #make swap for all swaps sudo blkid /dev/sda6 #get swap UUID
or ls -l /dev/disk/by-uuid
sudo gedit /etc/fstab
add UUID=XYZ none swap sw 0 0
sudo gedit /etc/initramfs-tools/conf.d/resume #add UUID sudo update-initramfs -u sudo reboot
