I'm looking at the Qt for Python1 documentation on how to install PySide6 and it should be simple enough: pip install pyside6 It doesn't work, though: ERROR: Could not find a version that satisfies the requirement pyside6 (from versions: none) ERROR: No matching distribution found for pyside6 I looked for it at pypi.org and found out the name of the package is PySide6, capitalized, not pyside6. Still, I tried it again, but had no luck: $ sudo pip install PySide6 ERROR: Could not find a version that satisfies the requirement PySide6 (from versions: none) ERROR: No matching distribution found for PySide6 Even if I explicitly pass --index-url to pip, as described in the official documentation, pip can't find pyside6 to install: $ sudo pip install --index-url=https://download.qt.io/snapshots/ci/pyside/6.5/latest/ PySide6 --trusted-host download.qt.io Looking in indexes: https://download.qt.io/snapshots/ci/pyside/6.0.0/latest ERROR: Could not find a version that satisfies the requirement pyside6 (from versions: none) ERROR: No matching distribution found for pyside6 (I tried several combinations of urls and package names) Any idea to what's going on? Other pyside versions are available apparently. Not pyside6, though. System information $ lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux 11 (bullseye) Release: 11 Codename: bullseye $ python3 --version Python 3.9.2 $ pip --version pip 23.0.1 from /usr/local/lib/python3.9/dist-packages/pip (python 3.9) Continue reading...