运行 sudo apt-get update 时出现以下错误
alika@vilnisi:~$ sudo apt-get update
[sudo] password for alika:
Hit:1 http: //deb.playonlinux.com precise InRelease
Hit:2 http: //archive.ubuntu.com/ubuntu bionic InRelease
Ign:3 http: //ppa.launchpad.net/glasen/freetype2/ubuntu bionic InRelease
Get:4 http:/ /archive.ubuntu.com/ubuntu bionic-updates InRelease [83,2 kB]
Hit:5 https: //dl.winehq.org/wine-builds/ubuntu bionic InRelease
Err:6 http: //ppa.launchpad.net/glasen/freetype2/ubuntu bionic Release
404 Not Found [IP: 91.189.95.83 80]
Get:7 http: //archive.ubuntu.com/ubuntu bionic-backports InRelease [74,6 kB]
Get:8 http: //archive.ubuntu.com/ubuntu bionic-security InRelease [83,2 kB]
Reading package lists... Done
E: The repository 'http:// ppa.launchpad.net/glasen/freetype2/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.