To stop DB2 LUW on a Linux system, you can use the following command as the instance owner:
```
db2stop
```
This will initiate a graceful shutdown of the database manager and all active databases. If the database manager is not responding, you can force a shutdown using the following command:
```

db2stop force
```
This will force a shutdown of the database manager and all active databases, even if there are active connections or uncommitted transactions. Use this command with caution as it may result in data loss or corruption.

Note: Make sure to backup any important data before stopping the database.
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