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There is 78GB what I see in the tool "Disk", the 78GB is mounted at /home. But in "Disk Usage" there is only 20GB total in my ubuntu, which is mounted at Filesystem Root.
I am sure that I take 100GB to Ubuntu from my hard disk.
So where is my lost 78GB of space? Please help me. Many thanks! Picture 1

There is another picture.Picture 2

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    The recommended minimum root partition size for Ubuntu is 25 GB. 20 GB is not sufficient for /
    – Archisman Panigrahi
    Commented Aug 22, 2021 at 6:47

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The partition 9 seems to be 78GB. If you click on that partition you should see where is mounted. As I understand your root partition si 20GB and /home partition is 78GB.

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  • Yes, it is mounted at /home. But just like what I show, the left of the picture tells me that the home is 20GB in total. And when I start Ubuntu, it warns me the storage is 900Mb free.
    – CHI NEW
    Commented Aug 22, 2021 at 6:31
  • @CHINEW The warning is because the / (root) is indeed almost full. When you have a single partition the space is shared for OS, programs and user files and settings. With a separated /home partition this one is used ONLY for personal files and settings. Again, giving only 20GB to root was a bad decision as it's almost full. The rest of the partitioning is also a mess: Ubuntu now uses a swapfile, no swap partition needed; you have an additional 512MB FAT partition probably not in use because you already have an ESP in the beginning of the drive, only one per system is needed.
    – ChanganAuto
    Commented Aug 22, 2021 at 12:29

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