Burn the image to SD card with dd/etcher/DiskWritter or your favorite tool.
Username: ubuntu
Password: ubuntu
SSH is enabled by default, so you can login directly after first boot.
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To get wireless connection working on boot you must edit /etc/netplan/01-rpi-3-network.yaml present in cloudimg-rootfs partition in your sdcard and add your SSID and PASSWORD.
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Filesystem will be expanded to fit your SD Card size on first boot.