/usr/share/doc/spring/HowToSyncDebug.txt is in spring 103.0+dfsg2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | How to use the sync debugger (for testers)
See https://springrts.com/wiki/Debugging_sync_errors
|