Installation error: unlink(/www/application/config/database.php): No such file or directory.

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Hello! I'm trying to do a new install of concrete5 5.7.5 on a Vagrant box running Ubuntu 14.04. The installation seems to get most of the way through (at least, from what I can tell of the progress bar), then fails with the following error:

unlink(/www/application/config/database.php): No such file or directory.
Trace:
#0 [internal function]: Whoops\Run->handleError(2, 'unlink(/www/app...', '/www/concrete/s...', 382, Array) #1 /www/concrete/src/Package/StartingPointPackage.php(382): unlink('/www/applicatio...') #2 [internal function]: Concrete\Core\Package\StartingPointPackage->finish() #3 /www/concrete/controllers/Install.php(264): call_user_func(Array) #4 [internal function]: Concrete\Controller\Install->run_routine('elemental_full', 'finish') #5 /www/concrete/src/Controller/AbstractController.php(156): call_user_func_array(Array, Array) #6 /www/concrete/src/Routing/ControllerRouteCallback.php(25): Concrete\Core\Controller\AbstractController->runAction('run_routine', Array) #7 /www/concrete/src/Routing/Router.php(59): Concrete\Core\Routing\ControllerRouteCallback->execute(Object(Concrete\Core\Http\Request), Object(Concrete\Core\Routing\Route), Array) #8 /www/concrete/src/Support/Facade/Facade.php(119): Concrete\Core\Routing\Router->execute(Object(Concrete\Core\Routing\Route), Array) #9 /www/concrete/src/Application/Application.php(366): Concrete\Core\Support\Facade\Facade::__callStatic('execute', Array) #10 /www/concrete/src/Application/Application.php(366): Concrete\Core\Support\Facade\Route::execute(Object(Concrete\Core\Routing\Route), Array) #11 /www/concrete/bootstrap/start.php(217): Concrete\Core\Application\Application->dispatch(Object(Concrete\Core\Http\Request)) #12 /www/concrete/dispatcher.php(36): require('/www/concrete/b...') #13 /www/index.php(2): require('/www/concrete/d...') #14 {main}


When I click the "Back" button, the installation process starts over and fails the same way.

Any thoughts?

Thanks!