However, Id like to configure my Ubuntu Server to stop deleting files from /tmp on boot due to custom configuration issue. How do I configure behavior of boot scripts to stop deleting files on boot?
Read it here
Users should not store files in /tmp, use /home or other partition, if you would like to keep the files. The behavior of boot scripts is controlled via a special configuration file called /etc/default/rcS. Open this file and modify TMPTIME variable.