1. Check that there has a $HOME/.bashrc file.
ls -l $HOME/.bashrc
If not, create it.
2. Check and edit $HOME/.bashrc as
# .bashrc
# User specific aliases and functions
# Source global definitions
if [ -f /etc/bashrc ]; then
. /etc/bashrc
fi
alias upgrade='dist-upgrade'
3. Check Terminal settings
4. log out and log in