Update ubuntu.md

[saberder]

Change the install order to make the docker service start during docker-ce installation

Proposed changes

Changed the install order of Ubuntu apt packages to make the docker systemctl service start during installation of docker-ce. Tested on Ubuntu 22.04

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[usha-mandya]

Thanks for the PR. Closing this PR here due to inactivity. Please create a new PR if the updates are still relevant. Thank you.