Edward Wu says to Ubuntu 台灣社群u0_a214@ubuntu-1804-lts:~$ sudo apt update Hit:1 http://asia-east1.gce.archive.ubuntu.com/ubuntu bionic InRelease Hit:2 http://asia-east1.gce.archive.ubuntu.com/ubuntu bionic-updates InRelease Hit:3 http://asia-east1.gce.archive.ubuntu.com/ubuntu bionic-backports InRelease Hit:4 http://archive.canonical.com/ubuntu bionic InRelease Ign:5 http://ppa.launchpad.net/djcj/screenfetch/ubuntu bionic InRelease Get:6 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB] Err:7 http://ppa.launchpad.net/djcj/screenfetch/ubuntu bionic Release 404 Not Found [IP: 91.189.95.83 80] Reading package lists... Done E: The repository 'http://ppa.launchpad.net/djcj/screenfetch/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.at Sat, May 9, 2020 1:53 PM