First, what do you see when under Tools you select "Get Board Info".
There will be more information about the loading errors if you go into the pull down menus File>Preferences and select to show verbose output during compile and upload.
Please report the complete messages you see when you try to load the "Bare Minimum" example sketch.
There have been some issues with Linux and the Nano Every related to the 1200 bps touch which puts the board into programming mode
https://forum.arduino.cc/t/cant-upload-sketches-to-nano-every-jtagmkii-getsync-sign-on-command-status-1/1058014/5