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Where possible, it's recommended to not use PPAs at all. Adding a PPA is essentially giving the owner of the PPA root (administrator) level access to your system. It is possible for them to maliciously or accidentially replace system packages with broken/unpatched/malicious versions. PPAs by trusted vendors are probably fine (Ubuntu, Libreoffice, etc), ...


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to delete a uncompatile or bad repository try this command in the termnial $ sudo nano /etc/apt/sources.list when nano is openned, remove that bad repository (manuelscheider) and press Ctrl + O to save and Ctrl + X to exit. After this operation run this command in the terminal $ sudo apt-get update && sudo apt-get upgrade -y And that is all. I hope ...


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