Inside of the /var/lib/tftpboot directory, open pxelinux.cfg/default using your favorite editor. Add these two lines to the top of the file:console 0 serial 0 19200 0Open ubuntu-installer/i386/boot-screens/text.cfg in your editor. We are going to remove and add a few things to the “append” line under the “install label”. We are going to remove the word quiet, and replace it with console=ttyS0,19..