According to the Ubuntu documentation, a minimum of 2 GB of disk space is required for a full Ubuntu installation, and more space to store any files you may subsequently create.

Is 20 GB enough for Ubuntu?

If you plan on running the Ubuntu Desktop, you must have at least 10GB of disk space. 25GB is recommended, but 10GB is the minimum.

Is 32gb enough for Ubuntu?

Ubuntu will only take around 10gb of storage, so yes, ubuntu will give you much more room for files if you choose to install it. However, 32gb isn’t very much no matter what you have installed, so buying a bigger drive might be a better option if you have a lot of files like videos, pictures, or music.