Software⏱️ 3 min read📅 2026-06-11

How to Fix: How to Fix schema com.canonical.indicator.datetime not installed error?

Error fixing schema com.canonical.indicator.datetime not installed in Ubuntu 13.10 with unity-tweak-tool.

Quick Answer: Run "sudo apt-get install -f" to fix missing dependencies.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

The 'schema com.canonical.indicator.datetime not installed' error occurs when attempting to use the Unity tweak tool in Ubuntu, resulting in an error message and a failed installation. This issue primarily affects users who have recently updated their system or have installed new packages that may have caused dependencies to become out of sync.

This error can be frustrating for users as it prevents them from customizing the look and feel of their Unity desktop environment. Fortunately, this issue can be resolved by identifying and addressing the root cause of the problem.

🔍 Why This Happens

  • The primary reason for this error is that the 'schema' package containing the necessary configuration files for the datetime indicator has not been installed or updated. This can occur when dependencies are out of sync due to recent system updates or package installations.
  • An alternative cause of this error could be related to the uninstallation of Evolution packages, which may have removed required dependencies or configuration files.

✅ Best Solutions to Fix It

Reinstalling the 'schema' package

  1. Step 1: Open a terminal and run the following command: `sudo apt-get update` to ensure that the package index is up-to-date.
  2. Step 2: Next, install the necessary dependencies by running the following command: `sudo apt-get install -f` This will fix any broken packages and resolve dependency issues.
  3. Step 3: Finally, reinstall the 'schema' package using the following command: `sudo apt-get install schema`

Restoring configuration files

  1. Step 1: Check if there are any remaining configuration files from Evolution that may be interfering with the datetime indicator. You can do this by running the following command: `find /etc/xdg/unity-tweak-tool -type f -name 'datetime-indicator.conf'` This will list all configuration files related to the datetime indicator.
  2. Step 2: If a configuration file is found, you can restore it from a backup or remove it altogether using the following command: `sudo mv /etc/xdg/unity-tweak-tool/datetime-indicator.conf~ /etc/xdg/unity-tweak-tool/`

💡 Conclusion

By following these steps, users should be able to resolve the 'schema com.canonical.indicator.datetime not installed' error and successfully use the Unity tweak tool to customize their desktop environment. If issues persist, it may be necessary to seek further assistance from a system administrator or IT professional.

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