this is probably because the Docker image that you are using for your build does not have lftp installed.
You can try looking for a DockerHub image that has it installed, or install it at runtime.
To install it, you might try `sudo apt-get install lftp` (assumes that apt-get is installed).
We are excited to announce the open beta program for self-hosted runners. Bitbucket Pipelines Runners is available to everyone. Please try it and let us know your feedback. If you have any issue...
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