537MB + 538MB + 79GB + 79GB is greater than 120GB.
Are you running Disks and dd from a Live Ubuntu USB?
Running from the source disk will not work.
I assumed by HDD size the computer boots Legacy mode, if it boots UEFI mode see sudodus' link.
Edit:
@ajgreeny: Ahh yes, 537MB + 538MB + 79GB is less than 120GB. Good thinking.
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