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Use ubuntu username instead of arcgis.
- Open SSH port 22 in security group of the instance. By default, only HTTP/HTTPS ports are open.
- ssh -i ~/.ssh/Joe-SDT.pem ubuntu@35.175.212.218
- sudo -i
- apt-get update
- apt install emacs
- apt upgrade
- It's OK to apply security patches and upgrade packages.
- reboot
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