I want to increase the size allocated for Ubuntu, but for this I need to reduce the size for Windows. Gparted does not allow managing Windows partitions. What to do?
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Do you get any error messages from gparted? Can you include a screenshot of your current partition layout? Please [edit] your post to add this information. – vidarlo Apr 21 '18 at 18:57
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Please search before asking. There are many articles about resizing partition from Windows. https://answers.microsoft.com/en-us/windows/forum/windows_10-files-winpc/resize-windows-10-system-partition/914938c2-a0f7-4ad0-9730-230ac6fe38ba – mikewhatever Apr 21 '18 at 19:01
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1@N0rbert: Every answer on that page discusses gparted. As Sudodus points out Windows tools should be used to shrink Windows partitions. – C.S.Cameron Apr 21 '18 at 22:57
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Boot into Windows and shrink the Windows partition using Windows tools. Leave the space that is released as unallocated.
Boot into a live Ubuntu DVD or USB drive.
Use gparted to create or edit partitions (and use the unallocated drive space).
If there are still problems for gparted, please reboot instead of shut down Windows. This avoids [semi]hibernating, and the file system will be ready for the linux tools. Later on you can turn of Fast Startup in Windows, which makes it stop semihibernating.

sudodus
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