Arduino on Linux/Manjaro --> ESP8266 Sketch Upload fails suddenly.... only Arduino-Boards work

Development Tools IDE 1.x
2

Make sure you have the correct port for the ESP8266 selected from the Arduino IDE's Tools > Port menu.

If you don’t know which port it is, you can find it like this:

  1. Unplug your Arduino board from the computer.
  2. Select Tools > Port from the Arduino IDE's menus.
  3. Note the ports, if any, listed in the menu.
  4. Close the Tools menu. The ports list is only updated when the Tools menu is re-opened, so this step is essential.
  5. Plug your Arduino board into the computer.
  6. Select Tools > Port from the Arduino IDE's menus. - The new port listed in the menu is your Arduino board.