[Bug 2025039] [NEW] Wrong disk space requirement: 18 GB requirement per text, 19.9 GB actually required to perform the installation

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For Ubuntu 23.04:

* I created a VM in virt-manager with 0,0 GiB (the unit used by virt-manager, only one decimal is allowed -- but this is not related to this filed issue) to find out about the required disk space. Ubiquity says that it requires 18 GB
* Created a new VM in virt-manager with 16,8 GiB (18.03886 GB). Tried to re-install. Uqiquity: "Not enought disk space to install Ubuntu. Required: 18 GB. Available: 17: GB"
* Created a new VM in virt-manager with 17,7 GiB (19.00523 GB). Tried to re-install. Uqiquity: "Not enought disk space to install Ubuntu. Required: 18 GB. Available: 18: GB"
* Created a new VM in virt-manager with 18,4 GiB (19.75685 GB). Tried to re-install. Uqiquity: "Not enought disk space to install Ubuntu. Required: 18 GB. Available: 18: GB"
* Created a new VM in virt-manager with 18,5 GiB (19.86423 GB). Tried to re-install. Uqiquity: No complaint, I could install the distro.

Also, please add a decimal to the required disk space even for whole
numbers ("19.9" in this case) to make it convenient to evaluate it.

** Affects: subiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment lunar
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Wrong disk space requirement: 18 GB requirement per text, 19.9 GB actually required to perform the installation
https://bugs.launchpad.net/bugs/2025039
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