在过去的一段时间里，我一直在尝试运行，sudo apt update以便准备将我的电脑升级到 Ubuntu 21.10。但是，每次运行它时，我都会收到以下类型的错误组合：
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://ppa.launchpad.net/ubuntuhandbook1/audacity/ubuntu focal InRelease: Couldn't execute /usr/bin/apt-key to check /var/lib/apt/lists/partial/ppa.launchpad.net_ubuntuhandbook1_audacity_ubuntu_dists_focal_InRelease
E: The repository 'http://ppa.launchpad.net/webupd8team/java/ubuntu focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
E: The repository 'http://ppa.launchpad.net/linuxmint-tr/araclar/ubuntu focal InRelease' is no longer signed.
E: Failed to fetch http://ppa.launchpad.net/linuxmint-tr/araclar/ubuntu/dists/focal/InRelease 403 Forbidden [IP: 91.189.95.85 80]
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://us.archive.ubuntu.com/ubuntu focal-updates InRelease: Couldn't execute /usr/bin/apt-key to check /var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_focal-updates_InRelease
E: Failed to fetch https://dl.bintray.com/scratux/stable/dists/focal/InRelease 403 Forbidden [IP: 34.214.192.151 443]
每次运行它时都会出现大量此类错误。发生了什么事？我该如何修复？
这是我的命令的完整输出： https://docs.google.com/document/d/1PziOBmZn1L1A0AuH5rc7jSiCDQLBSdmdv62VIagRh60/edit?usp=sharing
注意：sudo add-apt-repository --remove ppa:(需要删除的 ppa) 仅适用于其中一些错误，即使如此也并不总是有效。