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There could be several reasons why errors are not being displayed on Laravel Ubuntu. Some common reasons include:

1. Debug mode is turned off: Laravel has a debug mode that can be turned on or off. If it is turned off, then errors will not be displayed on the screen. Debug mode can be turned on by setting the APP_DEBUG variable to true in the .env file.

2. PHP error reporting is disabled: PHP has its own error reporting system that can be turned on or off in the php.ini file. If error reporting is turned off, then errors will not be displayed on the screen. To turn on error reporting, find the errorreporting directive in the php.ini file and set it to EALL.

3. Error logs are being written to a file: Laravel logs errors to a file by default. Check the storage/logs directory for error logs. If errors are being written to a log file, then they will not be displayed on the screen.

4. Server configuration is preventing error display: Some server configurations may prevent errors from being displayed on the screen for security reasons. Check the server configuration files to see if this is the case.

5. Browser is blocking pop-ups or JavaScript errors: Some errors may be displayed in a pop-up window or as a JavaScript alert. Check to make sure your browser is not blocking pop-ups or JavaScript errors.

6. Incorrect file permissions: Ensure the web server user has the necessary permissions to read/write to the log files.

To troubleshoot the issue, you may also enable the APP_DEBUG variable in your .env file.