咨询：执行apt更新升级时出现openstack-dashboard相关dpkg错误的原因

Hey there, let's dig into why you're getting that Sub-process /usr/bin/dpkg returned an error code (1) error with openstack-dashboard when running sudo apt-get update and sudo apt-get upgrade. I've troubleshooted this exact issue a handful of times, so here are the most likely causes:

• Unmet or Broken Dependencies
  OpenStack Dashboard (Horizon) depends on a bunch of other OpenStack components (Keystone, Nova, etc.) and system packages to run correctly. If any of these dependencies are missing, corrupted, or at a version that doesn't match Horizon's requirements, dpkg will fail to configure the package. To get the full details, run sudo apt-get upgrade -f—this will show you exactly which dependencies are causing the problem.

• Corrupted or Malformed Configuration Files
  Horizon relies heavily on its Python-based config files, especially /etc/openstack-dashboard/local_settings.py. If you edited this file manually and made a syntax mistake (like a missing comma, wrong indentation, or invalid variable), dpkg will choke when trying to apply updates. Look for lines in the error output that mention "syntax error" or "invalid configuration" related to these files. Sometimes the default config template from the package also gets corrupted during download.

• Damaged Package Files
  The openstack-dashboard package itself might have been partially downloaded or corrupted. This can happen if your internet connection dropped mid-upgrade, or if the repository mirror you're using has a bad copy of the package. Before you try reinstalling, make sure to back up your config files first: sudo cp /etc/openstack-dashboard/local_settings.py /etc/openstack-dashboard/local_settings.py.bak. Then you can purge and reinstall the package to fix this.

• Stuck Dpkg Lock or Running Processes
  Sometimes another process is holding the dpkg lock—like a background apt update, Synaptic package manager, or even a system update daemon. If dpkg can't get exclusive access to the package database, it'll throw this error. Check for stuck processes with ps aux | grep apt or ps aux | grep dpkg, kill any that are lingering, then run sudo dpkg --configure -a to fix any pending package configurations.

• OpenStack Release Version Mismatch
  OpenStack components are tightly coupled—all packages need to be from the same release train. If you're trying to upgrade openstack-dashboard to a newer release while keeping older versions of other OpenStack packages (like Keystone or Glance), this will cause configuration mismatches that break the dpkg setup. Double-check your repository sources to ensure they're all pointing to the same OpenStack release.

• Incorrect File Permissions
  Horizon's web server (usually Apache on Debian/Ubuntu) needs proper access to its files and directories. If the update process can't write to paths like /var/lib/openstack-dashboard/ or /usr/share/openstack-dashboard/ because of wrong ownership or permissions, dpkg will fail. Check the permissions with ls -ld /var/lib/openstack-dashboard/—it should be owned by the web server user (typically www-data).

内容的提问来源于stack exchange，提问作者ABHI KHANDELWAL