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I am wondering if I need to do things like Defragmentation and Clear Cache, to keep Ubuntu running smoothly like that done on Windows?

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Actually Fragmentation is there in NTFS where you install Windows, so you need to do defragmentation. while coming to Ubuntu , we install it in EXT type partitions & they don't need defragmentation because EXT not stores the data in fragmentation.

So no need of defragmentation for Ubuntu.To know more about fragmentation

while coming to cache , its a single word but connected to all areas of Ubuntu.

If you are running out of space , by clearing cache you can save your space.I do use bleachbit to clear cache that will remove apt-get cache , autoremove , autoclean , browsers cache and other in Ubuntu system. Removing old kernels also gives you more free space.

To know more about clearing cache

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