"Board at /dev/ttyACM0 is not available" error when opening Serial monitor/plotter (1.6.5)

[q2dg]

But when I upload the sketch it's fine.
I'm using Fedora 22 64 bits

[ffissore]

When you open a sketch, you don't open serial ports. When you open the serial monitor, the selected serial port must be available. If your issue is specific to the proposed plotter, please close this issue and comment at #2177

[q2dg]

Ok, thanks a lot! (how fast!, so glad)
Now it works perfectly