Ubuntu: Error when updating system


When I update my system, I got a problem, which is

Err:13 http://ppa.launchpad.net/wallch/wallch-daily/ubuntu xenial/main Sources    404  Not Found  

Error in terminal when updating the system

The output of Software Updater is:

Error in software updater

Please help me to resolve this problem.


Use the following command:

sudo add-apt-repository --remove ppa:wallch/wallch-daily  

Then run:

apt-get update  sudo apt-get upgrade  

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