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The error “unable to support jammy” typically occurs when trying to add an APT repository that does not have packages available for the Ubuntu Jammy (22.04) release. This can happen if the repository maintainer has not yet provided support for this Ubuntu version.

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Fix

To work around this issue, copy the apt_pkg shared object file from the existing Python installation to a more generic name that APT can recognize: 
# You may need to adjust the Python version (e.g., cpython-310) based on your system
cd /usr/lib/python3/dist-packages
sudo cp apt_pkg.cpython-310-x86_64-linux-gnu.so apt_pkg.so
Check your actual Python version by running python3 --version and adjust the filename accordingly (e.g., cpython-311 for Python 3.11).

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