Backport of Update commands for new Ubuntu version into v1.2

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Backport

This PR is auto-generated from #31348 to be assessed for backporting due to the inclusion of the label 1.2-backport.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

The below text is copied from the body of the original PR.

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Closes https://github.com/hashicorp/terraform/issues/30911#issuecomment-1170418101

Users let us know that the current install instructions don't work with the new apt update in Ubuntu 22.04 LTS. We investigated and updated the documentation, per the instructions from the Official Packaging Guide.

Our web engineering team will handle updating these commands on the Terraform Downloads page as well.

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