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How to delete all packages from a repository and then delete the repository and then delete the signing key?

cn flag

I'm running Ubuntu 21.10 and i made a mistake and downloaded Mono that's supposed to be used on a older version and now it's giving me error messages like

Sub-process /usr/bin/dpkg/ returned an error code (1)

Please help I downloaded the repository and key from here https://linuxize.com/post/how-to-install-mono-on-ubuntu-20-04/

David avatar
cn flag
What commands have you used the exact ones. You do not download a repository you add a link to the PPA so your question is confusing.
Turtleman avatar
cn flag
I followed what the tutorial said.
Turtleman avatar
cn flag
Hey, sorry for the late reply but I am not familiar with the terminology of linux so I just assumed it's was called donwloading. Everytime i tried to use Sudo apt-get --fix-broken install it just gives me a error message
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