我刚刚在双启动上安装了 Ubuntu 21.04，但是当我尝试使用时，sudo apt update我收到以下错误：
Ign:1 http://ppa.launchpad.net/mc3man/xerus-media/ubuntu hirsute
InRelease
Ign:2 http://download.opensuse.org/repositories/home:/strycore/xUbuntu_16.04
InRelease
Hit:3 http://archive.ubuntu.com/ubuntu hirsute InRelease
Hit:4 http://deb.playonlinux.com trusty InRelease
Err:5 http://download.opensuse.org/repositories/home:/strycore/xUbuntu_16.04 Release 404 Not Found [IP: 195.135.221.134 80]
Err:6 http://ppa.launchpad.net/mc3man/xerus-media/ubuntu hirsute Release 404 Not Found [IP: 91.189.95.85 80] Reading package lists... Done
E: The repository 'http://download.opensuse.org/repositories/home:/strycore/xUbuntu_16.04 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 …