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0e1f616
(Get the code!)
Did you create partitions during installation?
I think your "/" partition doesn't have enough space, which is why Ubiquity is failing. By the way, Ubuntu 18.04 doesn't use a swap partition, so you shouldn't need to create one.
The best approach is to use the entire 100GB disk in Virtual Box to install your customized Ubuntu, and let the installer manage the disk partitions. Is that what you are doing?