Thanks for your report.
Something has probably gone wrong with a previous install.
You can solve this by running the following command:
sudo apt-get install --reinstall ruby
Let us known if this fixes your problem.
** Changed in: ruby-defaults (Ubuntu)
Status: New => Incomplete
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package ruby 4.2 failed to install/upgrade: package ruby is already installed
and configured
https://bugs.launchpad.net/bugs/271473
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