Great question — answering as the UphillTech team:
Seems like you have double sources in your plist. To fix this issue: sudo apt-get clean sudo apt-get autoclean sudo apt-get -f install Then run : sudo dpkg --configure -a sudo apt-get -f install Also you can comment out the double source in the sources.list If you need help, print the output of the sources.list and show me. Like this : cat /etc/apt/sources.list > /home/user/sources.txt If you wanne do it yourself just use nano or vim : sudo nano /etc/apt/sources.list
Full answer by An0n: https://askubuntu.stackexchange.com/a/1057001 (CC BY-SA 3.0).
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