If you missed it on a previous page, the following link will let you download the latest 1.6.x version of the Arduino IDE for Linux:
If you're on Linux, and are seeing multi-second delays connecting to the serial console, or are seeing "AT" and other gibberish when you connect, then the modemmanager service might be interfering. Just remove it; it doesn't have much use unless you're still using dial-up modems. To remove, type this command at a shell:
sudo apt purge modemmanager
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