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#find where the definition of the apt repo is located
sudo grep -i filename /etc/apt/sources.list.d/*.list
#edit the file...
sudo -H gedit /etc/apt/sources.list (ignore any warning messages)
#or
sudo -H gedit /etc/apt/sources.list.d/found_filename.list (ignore any warning messages)
#Find the line that starts with:
deb https://blah blah blah
#And change it to:
deb [arch=amd64] https://blah blah blah
#Save the file and quit the editor.
#Now sudo apt-get update and sudo apt-get upgrade will run without the noise.