Re-install Buildkit on Ubuntu for Windows
If you've run amp, you should also delete the hidden folder $HOME/.amp.  Leaving --full out of the install command will skip installing apps.  Hoewver, There is no side effect to reinstalling the apps, and it includes ancillary programs like zip and curl, so you're most likely best off running with --full.  It will also restart Apache for you, which might be necessary.