My Bash aliases don't work

Add this to the end of your .bashrc:

if [ -f $HOME/.bash_aliases ]
then
  . $HOME/.bash_aliases
fi

I had a similar problem recently. The solution appeared to be closing ALL open shells (root and user; I didn't notice that I was running a minimized root shell at the time while editing my user .bashrc and .bash_aliases files). The .bash_aliases file then seemed to get read.

By default

if [ -f ~/.bash_aliases ]; then
.  ~/.bash_aliases
fi

These are available in your .bashrc file in ubuntu 18,19 Actually the problem is sourcing the files, therefore source both files by runing the commands below. I faced the same issues and that is how i solved it.

source ~/.bashrc
source ~/.bash_aliases