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I have been dual booting windows 7 and Ubuntu. I ran out of space on my C: today, and decided to format the partition that Ubuntu was on. I then downloaded a third party disk manager and created a new partition with the free space and merged it with my D: Data. I then split my D:, creating 40 GB on the right of my C:. I tried to merge that 40 GB partition with my C: then exited the disk manager, but nothing seemed to have happened, I checked and my C: still only had 5 GB of free space. So I restarted my laptop but when it booted up, it went straight to the unknown filesystem error.

I've tried a few of the solutions I've found through googling, but after the insmod normal bit, it always gives error: no such partition.

What can I do from here please?

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You can try following the solution in this link: askubuntu.com/questions/264931/… and also refer this link: askubuntu.com/questions/312080/… –  user223882 Apr 20 '14 at 21:16

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