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You will need to remove the PostgreSQL source from your apt list. Fortunately, it's not too difficult to do via the Terminal. Here's how you do it: Open Terminal (if it's not already open) Change directories to /etc/apt/sources.list.d: cd /etc/apt/sources.list.d List the files in that directory: ll You will see something like this: total 16 drwxr-xr-x 2 ...


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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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