Ubuntu: fix apt-get usage #291

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	name: readthedocs/actions

	on:
	pull_request_target:

	permissions:
	pull-requests: write

	jobs:
	pull-request-links:
	runs-on: ubuntu-latest
	steps:
	- uses: readthedocs/actions/preview@v1
	with:
	project-slug: "cloudstack-documentation"

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