If want to use it, it needs to add new username and password into it.
and remove some packages.Download cloud Image from ubuntu, ex: download Ubuntu Zesty Cloud Image

wget https://cloud-images.ubuntu.com/zesty/current/zesty-server-cloudimg-arm64.img 

If locate in Taiwan, there is Taiwan mirror site,http://ftp.yzu.edu.tw/Linux/ubuntu-cloud-images/, it would be fast then cloud-images.ubuntu.com

wget http://ftp.yzu.edu.tw/Linux/ubuntu-cloud-images/zesty/current/zesty-server-cloudimg-arm64.img

Zesty only has UEFI image, so, there is no -disk1 or -uefi postfix keyword.

If used bionic (Ubuntu 18.04), if you found change password function doesn’t work.
Please shutdown this image (suppose run with QEMU) and run change password command again .

Suppose that something modify password when booting on Ubuntu 18.04.

Install backdoor-image package, this program can help to install new username and password into cloud image.

apt install bzr qemu-utils  
bzr branch lp:~smoser/+junk/backdoor-image  

sudo apt-get install -qy cloud-image-utils git
git clone https://gist.github.com/8c65b8771d5ab1d99c44c285323dfff6.git backdoor-image

Add new password, but first account is not work for me most time, so, I would like to add new username and password. (note: please don’t use this as default password on business purpose. )

cd backdoor-image  
sudo ./backdoor-image --user ubuntu --password ubuntu --password-auth ../zesty-server-cloudimg-arm64.img 
sudo ./backdoor-image --user test --password 123456 --password-auth ../zesty-server-cloudimg-arm64.img 

After boot into virtual machine with this image, it can remove unnecessary packages.

sudo apt remove cloud-initramfs-copymods cloud-init

The post Change Ubuntu Cloud Image Password appeared first on richliu's blog.