What are the most common causes for 'dpkg returned an error code 1' during package management?

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Grade: Education Subject: Support
What are the most common causes for 'dpkg returned an error code 1' during package management?
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Common causes include unmet dependencies where a package requires another that isn't installed or is conflicting, partially installed or broken packages from previous failed attempts, issues with package post-installation scripts that fail during execution, insufficient disk space on the system, corrupted package database files (like `/var/lib/dpkg/status`), or sometimes even file permission issues.