How i can remove all softwares of Ubuntu server and make it lock like Ubuntu Desktop without GUI? to make boot faster.
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Since you're willing to experiment with your system, and don't mind reinstalling (I take those two as prerequisites for your question), you could remove the ubuntu-server metapackage for starters:
sudo apt remove ubuntu-server
This will remove a bunch of server-related tools, and their dependencies (I've removed a bunch of those myself on my own server). If you need any of the tools afterward, you can then install them manually.
You're also right that removing cloud-init will help - please see this existing answer.
I'm not sure this will affect your bootup time that much, but I believe it is the most precise answer to your question.
Artur Meinild
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