I am not a technical person. while I set up putty, I am on typing the exit stage. on that time a small popup was opened it shows I software caused connection abort. then I try to type exit but it not work so I closed and open the putty, when I enter “sudo dd if=/dev/zero of=/mnt/swap.0 bs=1024 count=1048576” it shows text file is busy. check the attached file. how to over come this?