ERROR: No matching distribution found for poetry==1.5.1

I had an issue installing on both Rocky Linux 8.7 and Ubuntu 20.04 LTS. Where the Official installer was failing to select a version that was available in the repo, and was just blindly trying to install v1.5.1. The solution was to specify a newer version of pythoon

Official instructions state the command to install is
curl -sSL https://install.python-poetry.org | python3 -

But this was resulting in Python 3.6 being used, which apparently is no longer supported. I had 3.9 installed on the systems.
The installer should really run a check to see if the python version it is using is too old and not supported and give an appropriate error. Alternatively, it could select the most up to date version that is available on that repo. Either way, it shouldn't fail with this error.

curl -sSL https://install.python-poetry.org | python3.9 - worked, but I wasted a fair bit of time working out why it was failing.

まず、Python 3.6 で公式インストーラーコマンドを再現し、issue に記載されている動作する Python 3.9 コマンドと比較します。インストーラーが Poetry 1.5.1 を選択する仕組みを追跡し、サポートされていない Python バージョンに対して明確なエラーを出すべき箇所を特定します。古いインタープリターが誤解を招くディストリビューションエラーで失敗しなくなれば完了です。