Ubuntuはリポジトリを読むことができません

Ubuntuはリポジトリを読むことができません

Ubuntu 19.04でこのコマンドを実行しました。

sudo apt update
Hit:1 http://fi.archive.ubuntu.com/ubuntu bionic InRelease
Hit:2 http://fi.archive.ubuntu.com/ubuntu bionic-security InRelease                                                                                                                                        
Hit:3 http://linux.teamviewer.com/deb stable InRelease                                                                                                                                                     
Ign:4 http://ppa.launchpad.net/gezakovacs/ppa/ubuntu disco InRelease                                                                                                                                       
Hit:5 http://fi.archive.ubuntu.com/ubuntu bionic-updates InRelease                                                                                                                                         
Hit:6 http://fi.archive.ubuntu.com/ubuntu bionic-proposed InRelease                                                                                                                                        
Hit:7 http://fi.archive.ubuntu.com/ubuntu bionic-backports InRelease                                                                                                                                       
Hit:8 https://download.mono-project.com/repo/ubuntu vs-bionic InRelease                                                                                                                                    
Hit:9 http://ppa.launchpad.net/teejee2008/ppa/ubuntu disco InRelease                                                                                                                                  
Hit:10 https://packages.microsoft.com/ubuntu/19.04/prod disco InRelease                                                                                                         
Err:11 http://ppa.launchpad.net/gezakovacs/ppa/ubuntu disco Release                                                                                                         
  404  Not Found [IP: 91.189.95.83 80]
Hit:12 https://download.sublimetext.com apt/stable/ InRelease                                                              
Get:13 https://gitlab.com/paulcarroty/vscodium-deb-rpm-repo/raw/repos/debs vscodium InRelease [2 400 B]
Reading package lists... Done             
E: The repository 'http://ppa.launchpad.net/gezakovacs/ppa/ubuntu disco 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.

エラーが表示されるのはなぜですか?次のリポジトリがあります/etc/apt/sources.list

#------------------------------------------------------------------------------#
#                            OFFICIAL UBUNTU REPOS                             #
#------------------------------------------------------------------------------#


###### Ubuntu Main Repos
deb http://fi.archive.ubuntu.com/ubuntu/ bionic main restricted universe multiverse 

###### Ubuntu Update Repos
deb http://fi.archive.ubuntu.com/ubuntu/ bionic-security main restricted universe multiverse 
deb http://fi.archive.ubuntu.com/ubuntu/ bionic-updates main restricted universe multiverse 
deb http://fi.archive.ubuntu.com/ubuntu/ bionic-proposed main restricted universe multiverse 
deb http://fi.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse 

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