Cannot Upload to Uno Board. Permission Denied

This is a new install of the IDE on Ubuntu 20.4. I am trying to upload the Blink example to an Uno just to test that I am able to upload code. It did not work. I was able to select Uno as my board and I selected the only available port which was dev/ttyUSB0. The programmer was preset to USBtinyISP. Here is the error message with verbose enabled:

Arduino: 1.8.13 (Linux), Board: "Arduino Uno"

Sketch uses 924 bytes (2%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
/home/alphagenius/Apps/Arduino/hardware/tools/avr/bin/avrdude -C/home/alphagenius/Apps/Arduino/hardware/tools/avr/etc/avrdude.conf -v -patmega328p -carduino -P/dev/ttyUSB0 -b115200 -D -Uflash:w:/tmp/arduino_build_440354/Blink.ino.hex:i 

avrdude: Version 6.3-20190619
         Copyright (c) 2000-2005 Brian Dean,
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "/home/alphagenius/Apps/Arduino/hardware/tools/avr/etc/avrdude.conf"
         User configuration file is "/home/alphagenius/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : /dev/ttyUSB0
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200
avrdude: ser_open(): can't open device "/dev/ttyUSB0": Permission denied

avrdude done.  Thank you.

Problem uploading to board.  See for suggestions.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Try this:

That solved the problem. Thank you so much.

You're welcome. I'm glad to hear it's working now. Enjoy!