[Ubuntu-BD] Tune up, Tweaks, Troubleshoot

[9el]

I think there's not much shared about tuning up the linux/ubuntu systems
regarding running processes, services, installation, upgrade etc

lets share these things in this thread.
1. How to check integrity of the system?
2. How to check for broken links/dependencies?
3. How to Eliminate unnecessary programs/processes from running.
4. How you can speed up your computing?
5. How you can utilize your resources better?
There can be more questions....

:)

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