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I am trying to cloning ardupilot git.

I tried to run git submodule update --init --recursive on Ubuntu 20.04 and get this error each time:

Cloning into '/home/asma/ardupilot/modules/libcanard'...
fatal: unable to connect to github.com:
github.com[0: 140.82.121.4]: errno=Connection refused

fatal: clone of 'git://github.com/ArduPilot/libcanard.git' into submodule path '/home/asma/ardupilot/modules/libcanard' failed
Failed to clone 'modules/libcanard'. Retry scheduled
Cloning into '/home/asma/ardupilot/modules/libcanard'...
fatal: unable to connect to github.com:
github.com[0: 140.82.121.3]: errno=Connection refused

fatal: clone of 'git://github.com/ArduPilot/libcanard.git' into submodule path '/home/asma/ardupilot/modules/libcanard' failed
Failed to clone 'modules/libcanard' a second time, aborting
user16217248
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Asma Rami
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  • `git://` protocol was disabled at Github in 2021. Switch submodule URLs to `https://` or `ssh://`. Use URL rewriting; see https://stackoverflow.com/a/10729634/7976758 – phd Apr 07 '23 at 10:41

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