I tried to install Spatie Backup which is a package to backup database and folder in Laravel.After i downloaded and configured it i had run php artisan backup:run and this this error above showed up.
Errors was that it didnt found mysqldump so i resolve it by typing which mysqldump
After i added in .env
Run again the commabds php artisan backup:run and voilà !
Before comming with this solution i found that when you execute
php artisan backup:run --db-name=agecetweb
without adding the path to the mysqldump the project is backed up but without the database aka the same as php artisan backup:run --only-files.
This commands php artisan backup:run --help display options to add and is very useful too.