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I have installed 2 OS in my disk, first one is windows and the second one is ubuntu, I want to reinstall ubuntu and combine partitions however I'm not sure if I do it, it could cause some trouble.

Reason to combine free partitions is due to I need more free space for applications.

Leo T
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    Without backups in case of a problem, you are sure to encounter a problem. See How to resize partitions? – user535733 Mar 27 '20 at 23:12
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    Backup to an external drive or to the cloud, then verify (checksums work well and rapidly) the backups mach the original; then make another backup to a different destination (external drive or cloud) and verify it, Once backups are made, please run lsblk | grep -v loop && df -h | grep -v loop|tempfs| so we can see what partitions are on your drives; highlight the resulting text, copy it as text, come back here, click [edit], and paste the resulting text into your question. Please don't use Add Comment as that scrambles the formatting of the info. – K7AAY Mar 27 '20 at 23:17

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I regularly resize using a application called 'gparted'. It is available in a 'ISO' from the following URL --> https://sourceforge.net/projects/gparted/ . I do not have any dual boot systems and certainly not with one being Windows but I have had great luck with it. It is capable and I have had zero problems with it in Resizing and/or Enlarging Partitions. I have for many years used this app by burning the Bootable ISO image to a CD. Recently I have put the image on a USB Thumb Drive.

I feel that it would work for you, given the Linux is after the Windows, on the drive. This app is a great open source program. As to what it might do to your Windows stuff I proffer no advice whatsoever. It should not create any problems but not sure about the validation thingy ; - )) Robert