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I am using Ubuntu MATE. I am trying to open Ubuntu Software & Updates and Software Updater. So, I clicked on Control Center and I am clicking on Software & Updates and Software Updater. But they are not opening.

What's the problem and how can I fix it?

sudo apt update
[sudo] password for souvik: 

...               
Err:7 http://ppa.launchpad.net/cassou/emacs/ubuntu xenial Release              
  404  Not Found
...                                                  
E: The repository 'http://ppa.launchpad.net/cassou/emacs/ubuntu xenial Release' does not have a Release file.

Thanks and Regards

Zanna
  • 72,312
Souvik Maity
  • 31

1 Answers1

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The PPA from your error message is outdated and no longer maintained, so we need to remove it with commands below:

sudo apt install ppa-purge
sudo ppa-purge ppa:cassou/emacs

if this command fails - remove this PPA from the system with another command: 

sudo add-apt-repository -r ppa:cassou/emacs

And then you can use your system as before. As starting point you may want to install all updates:

sudo apt update
sudo apt upgrade
N0rbert
  • 103,263