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When you have multiple APT repositories configured for the same software, it’s important to know which one is being used — especially after adding a new repository while the system still uses an older one.
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Check the pinned priority
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APT uses the repository with the highest priority. Check priorities with:
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apt-cache policy
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To check the priority for a specific package (e.g., docker-ce):
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apt-cache policy docker-ce
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Sample output:
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docker-ce:
  Installed: (none)
  Candidate: 5:20.10.24~3-0~ubuntu-jammy
  Version table:
     5:20.10.24~3-0~ubuntu-jammy 500
        500 https://download.docker.com/linux/ubuntu jammy/stable amd64 Packages
     5:20.10.24~3-0~ubuntu-focal 500
        500 https://download.docker.com/linux/ubuntu focal/stable amd64 Packages
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The Candidate version indicates which repository is being used.
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Inspect the installed package source
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If the package is already installed, check which repository it came from:
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apt-cache policy docker-ce
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Manually manage repository files
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If you want to ensure only one repository is used, comment out or remove the unwanted entry:
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sudo nano /etc/apt/sources.list.d/download_docker_com_linux_ubuntu.list
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Comment out the unwanted line:
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# deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable
deb [arch=amd64] https://download.docker.com/linux/ubuntu jammy stable
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Then update the package cache:
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sudo apt update
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Verify the repository again
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After making changes, confirm the correct repository is being used:
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apt-cache policy docker-ce

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