I installed it by running sudo apt-get install phpymyadmin and then running
sudo ln -s /usr/share/phpmyadmin/ /usr/share/nginx/html and
Finally it worked for me, few things I had to fix:
Homestead.yaml file:
- map: phpmyadmin.test
to: /home/vagrant/code/phpmyadmin/
I had to delete /public from the end. I installed phpmyadmin (after vagrant ssh command from Homestead directory) into the 'code' folder where the other projects are. When 'code' is with lowercase, it has to be everywhere so (or other way around): folder name, yaml file or even after installation performing these commands:
sudo ln -s /usr/share/phpmyadmin/ /home/vagrant/code/phpmyadmin
cd ~/code && serve phpmyadmin.test /home/vagrant/code/phpmyadmin