Ubuntu GUI: Add 22.04, update older versions

[b-ehlers]

Added 22.04, updated older versions and removed versions, that are no longer available.

22.04 shows a blank screen with "-vga virtio", so I took the second best "-vga qxl". I verified, that this setting works with all versions.

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Before submitting a pull request, please check the following.

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When updating an existing appliance:

• [x] The new version is on top.
• [x] The filenames in the "images" section are unique, to avoid appliances / version overwriting each other.

• [x] If you forked the repo, running check.py doesn't drop any errors for the updated file.