質問: apt-get updateエラーのランチパッド apt-get updateの最後に次のエラーメッセージが表示されます:w: the repository 'http://ppa.launchpad.net/mc3man/trusty-media/ubuntu/dists trusty release' does not have a release file. n: data from such a repository can't be authenticated and is therefore potentially dangerous to use. n: see apt-secure(8) manpage for repository creation and user configuration details. w: the repository 'http://ppa.launchpad.net/mc3man/trusty-media/ubuntu xenial release' does not have a release file. n: data from such a repository can't be authenticated and is therefore potentially dangerous to use. n: see apt-secure(8) manpage for repository creation and user configuration details. e: failed to fetch http://ppa.launchpad.net/mc3man/trusty-media/ubuntu/dists/dists/trusty/main/binary-amd64/packages 404 not found e: failed to fetch http://ppa.launchpad.net/mc3man/trusty-media/ubuntu/dists/xenial/main/binary-amd64/packages 404 not found e: some index files failed to download. they have been ignored, or old ones used instead. これが私のソースファイルの外観です。# deb http://mirrors.linode.com/ubuntu/ xenial main restricted # deb http://mirrors.linode.com/ubuntu/ xenial-updates main restricted # deb http://security.ubuntu.com/ubuntu xenial-security main restricted # see http://help.ubuntu.com/community/upgradenotes for how to upgrade to # newer versions of the distribution. deb http://mirrors.linode.com/ubuntu/ xenial main restricted # deb-src http://mirrors.linode.com/ubuntu/ xenial main restricted ## major bug fix updates produced after the final release of the ## distribution. deb http://mirrors.linode.com/ubuntu/ xenial-updates main restricted # deb-src http://mirrors.linode.com/ubuntu/ xenial-updates main restricted ## n.b. software from this repository is entirely unsupported by the ubuntu ## team. also, please note that software in universe will not receive any ## review or updates from the ubuntu security team. deb http://mirrors.linode.com/ubuntu/ xenial universe # deb-src http://mirrors.linode.com/ubuntu/ xenial universe deb http://mirrors.linode.com/ubuntu/ xenial-updates universe # deb-src http://mirrors.linode.com/ubuntu/ xenial-updates universe ## n.b. software from this repository is entirely unsupported by the ubuntu ## team, and may not be under a free licence. please satisfy yourself as to ## your rights to use the software. also, please note that software in ## multiverse will not receive any review or updates from the ubuntu ## security team. deb http://mirrors.linode.com/ubuntu/ xenial multiverse # deb-src http://mirrors.linode.com/ubuntu/ xenial multiverse deb http://mirrors.linode.com/ubuntu/ xenial-updates multiverse # deb-src http://mirrors.linode.com/ubuntu/ xenial-updates multiverse ## n.b. software from this repository may not have been tested as ## extensively as that contained in the main release, although it includes ## newer versions of some applications which may provide useful features. ## also, please note that software in backports will not receive any review ## or updates from the ubuntu security team. deb http://mirrors.linode.com/ubuntu/ xenial-backports main restricted universe multiverse # deb-src http://mirrors.linode.com/ubuntu/ xenial-backports main restricted universe multiverse ## uncomment the following two lines to add software from canonical's ## 'partner' repository. ## this software is not part of ubuntu, but is offered by canonical and the ## respective vendors as a service to ubuntu users. # deb http://archive.canonical.com/ubuntu xenial partner # deb-src http://archive.canonical.com/ubuntu xenial partner deb http://security.ubuntu.com/ubuntu xenial-security main restricted # deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted deb http://security.ubuntu.com/ubuntu xenial-security universe # deb-src http://security.ubuntu.com/ubuntu xenial-security universe deb http://security.ubuntu.com/ubuntu xenial-security multiverse # deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable # deb-src [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable deb http://ppa.launchpad.net/mc3man/trusty-media/ubuntu/dists trusty main # deb-src http://ppa.launchpad.net/chris-lea/libsodium/ubuntu xenial main webブラウザで ppaリンク を開きましたが、エラーはありません。
回答: 配布バージョンは16.04です。しかし ご覧のとおり このppaにはxenial用のパッケージはありません。ubuntuの信頼できる(14.04)バージョンのパッケージのみがあります。このppaを削除するには、次のコマンドを試してください。sudo add-apt-repository -r ppa:mc3man/trusty-media sudo apt update 問題を解決する必要があります。