get error message while using "sudo apt-get update"

Question

:~$ sudo apt-get update
Hit:1 http://ftp.sjtu.edu.cn/ubuntu bionic InRelease
Hit:2 http://ftp.sjtu.edu.cn/ubuntu bionic-updates InRelease                                                
Hit:3 http://ftp.sjtu.edu.cn/ubuntu bionic-backports InRelease                                              
Hit:4 http://ftp.sjtu.edu.cn/ubuntu bionic-security InRelease                                               
Hit:5 http://packages.microsoft.com/repos/vscode stable InRelease                                           
Hit:6 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu bionic InRelease                                       
Ign:7 http://ppa.launchpad.net/fkrull/deadsnakes/ubuntu bionic InRelease                                    
Ign:8 https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa bionic InRelease                    
Err:9 http://ppa.launchpad.net/fkrull/deadsnakes/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.85 80]
Err:10 https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa bionic Release
  404  Not Found [IP: 91.189.89.223 443]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/fkrull/deadsnakes/ubuntu bionic 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.
E: The repository 'https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa bionic 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.

Answer 1

换源吧