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4.2.6. Clean up leftover configuration files
A previous upgrade may have left unused copies of configuration files; old versions of configuration files, versions supplied by the package maintainers, etc. Removing leftover files from previous upgrades can avoid confusion. Find such leftover files with:
Nothing is shown to be removed. If you run the command as root or using sudo the find command will be able to look into those directories which are "Permission Denied". Run as user, if there was a file to be removed it would be shown similar to this where, in this case on this system, there is only one file indicated: