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faisal@faisal-thinkpad-x220:~$ sudo apt update

Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [94.5 kB]

Hit:2 http://ppa.launchpad.net/budgie-remix/ppa/ubuntu xenial InRelease  

Hit:3 http://kw.archive.ubuntu.com/ubuntu xenial InRelease                    

Ign:4 http://ppa.launchpad.net/evolve-os/ppa/ubuntu xenial InRelease          

Hit:5 http://kw.archive.ubuntu.com/ubuntu xenial-updates InRelease            

Hit:6 http://ppa.launchpad.net/fossfreedom/budgie-desktop/ubuntu xenial InRelease

Hit:7 http://kw.archive.ubuntu.com/ubuntu xenial-backports InRelease          

Hit:8 http://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu xenial InRelease

Hit:9 http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu xenial InRelease      

Hit:10 http://ppa.launchpad.net/numix/ppa/ubuntu xenial InRelease              

Err:11 http://ppa.launchpad.net/evolve-os/ppa/ubuntu xenial Release            

  404  Not Found

Reading package lists... Done                                                  

E: The repository 'http://ppa.launchpad.net/evolve-os/ppa/ubuntu xenial Release' does not have a Release file.

N: Updating from such a repository can't be done securely, and is therefore disabled by default.

N: See apt-secure(8) manpage for repository creation and user configuration details.

faisal@faisal-thinkpad-x220:~$ sudo apt install budgie-desktop

Reading package lists... Done

Building dependency tree      

Reading state information... Done

Some packages could not be installed. This may mean that you have

requested an impossible situation or if you are using the unstable

distribution that some required packages have not yet been created

or been moved out of Incoming.

The following information may help to resolve the situation:

 

The following packages have unmet dependencies:

 budgie-desktop : Depends: budgie-core but it is not going to be installed

E: Unable to correct problems, you have held broken packages.

faisal@faisal-thinkpad-x220:~$