-1 repository software-sources
The repository 'http://ppa.launchpad.net/dirk-computer42/c42-backport/ubuntu eoan 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.
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我该如何解决这个问题?