Hey,
I'm running the latest IDE in Ubuntu. The software is able to detect the Arduino Uno, yet when I try to upload a sketch I get the following message:
avrdude: ser_open(): can't open device "/dev/ttyACM0": Permission denied
Why is that ?
Did you make yourself a member of the dialout group? And if yes, did you log out / log in again so the changes could take effect?
I gave myself and the group permission in the settings of the Arduino-ide file.
The program that complains in your opening post is avrdude. Not the IDE 
See https://support.arduino.cc/hc/en-us/articles/360016495679-Fix-port-access-on-Linux#dialout.
That worked - Thank you!
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