These are only fixes for the encountered errors and problems. Follow the official tutorial until you encounter them!
The compiler for ESP32 is not installed. (Why is this not in the turorial???)
Basically follow https://randomnerdtutorials.com/installing-the-esp32-board-in-arduino-ide-windows-instructions/.
You can have both "Additional Boards Manager URLs" by concatening them with "," like:
https://dl.espressif.com/dl/package_esp32_index.json,https://raw.githubusercontent.com/e-radionicacom/Croduino-Board-Definitions-for-Arduino-IDE/master/package_Croduino_Boards_index.json
Install the package "esp32" by "Espressif Systems.
Your device is probably on /dev/ttyUSB0 you can verify this by checking if it is only there when Inkplate 6 is connected. If it is something else, your Arduino IDE might have other ideas.
I have no idea about the correct udev rules but a simple chown to your user works.
In case you see something like:
Sketch uses 273440 bytes (8%) of program storage space. Maximum is 3145728 bytes.
Global variables use 14068 bytes (4%) of dynamic memory, leaving 313612 bytes for local variables. Maximum is 327680 bytes.
esptool.py v2.6
Serial port /dev/ttyUSB0
Connecting....
Chip is ESP32D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
MAC: 24:62:ab:d8:18:40
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 921600
Changed.
Configuring flash size...
A fatal error occurred: Invalid head of packet (0xE0)
A fatal error occurred: Invalid head of packet (0xE0)
Then it is your pload speed as suggested by https://community.platformio.org/t/a-fatal-error-occurred-invalid-head-of-packet/10233.
Change it in Tools -> Upload speed -> 460800. In case you need something custom, the file is in ~/.arduino15/packages/Croduino_Boards/hardware/esp32/1.0.0/boards.txt and look for "Inkplate6.menu.UploadSpeed"