It looks like we do not have customized .bashrc files on the AWS instance of Ubuntu. Instead, you can create a customized script to setup your defaults.
Refer: https://serverfault.com/questions/491585/is-there-a-global-bash-profile-for-all-users-on-a-system
Refer: https://bash.cyberciti.biz/guide//etc/profile.d
sudo su -
nano /etc/profile.d/mlr.sh
Sample Content
PS1="\n# ${USER}@${HOSTNAME}\n# \${PWD}\n$ "
alias ll='ls -l' 2>/dev/null
alias l.='ls -d .*' 2>/dev/null