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apt updateでこの出力を取得する理由

Sudo apt updateを実行しましたが、次のようになります。 sources.listにはTMSUリポジトリがありませんが、http://ppa.launchpad.net/tmsu/daily/ubuntu artful Release' does not have a Release fileは取得されます。 Stretchのバックポートへのアクセスにも問題があります

Get:63 http://ftp.fr.debian.org/debian unstable/main Translation-en [5,789 kB]                                                                       
Reading package lists... Done                                                                                                                        
E: The repository 'http://ppa.launchpad.net/tmsu/daily/ubuntu artful 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.
E: Could not open file /var/lib/apt/lists/http.debian.net_debian_dists_stretch-backports_main_binary-AMD64_Packages.diff_Index - open (2: No such file or directory)
E: Could not open file /var/lib/apt/lists/http.debian.net_debian_dists_stretch-backports_main_binary-i386_Packages.diff_Index - open (2: No such file or directory)
E: The repository 'http://httpredir.debian.org/debian stretch Release' is no longer signed.
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.

私の/etc/apt/sources.list

# 

deb http://ftp.fi.debian.org/debian/ stretch main
# deb http://ftp.us.debian.org/debian/ stretch main
deb-src http://ftp.fi.debian.org/debian/ stretch main
# deb-src http://ftp.us.debian.org/debian/ stretch main

deb http://security.debian.org/ stretch/updates main contrib
deb-src http://security.debian.org/ stretch/updates main contrib

# stretch-updates, previously known as 'volatile'
deb http://ftp.fi.debian.org/debian/ stretch-updates main contrib
# deb http://ftp.us.debian.org/debian/ stretch-updates main contrib
deb-src http://ftp.fi.debian.org/debian/ stretch-updates main contrib
# deb-src http://ftp.us.debian.org/debian/ stretch-updates main contrib

# stretch backports
deb http://http.debian.net/debian stretch-backports main contrib non-free

deb http://httpredir.debian.org/debian/ stretch main contrib

# NO package
# deb http://cran.wu.ac.at/bin/linux/debian stretch-cran3/

# https://unix.stackexchange.com/a/366085/16920
deb http://ftp.fr.debian.org/debian unstable main

# https://cran.r-project.org/
# http://stackoverflow.com/q/44026585/54964
deb https://ftp.eenet.ee/pub/cran/bin/linux/debian stretch-cran34/
deb [Arch=AMD64] https://download.docker.com/linux/debian stretch stable
# deb-src [Arch=AMD64] https://download.docker.com/linux/debian stretch stable

Sgargelの提案をテストする

masi@masi:/etc/apt/sources.list.d$ grep -R tmsu
tmsu-ubuntu-daily-artful.list:deb http://ppa.launchpad.net/tmsu/daily/ubuntu artful main
tmsu-ubuntu-daily-artful.list:# deb-src http://ppa.launchpad.net/tmsu/daily/ubuntu artful main

OS：Debian 9

debianaptsoftware-updatesbackports
1
Léo Léopold Hertz 준영

ppa.launchpad.net/tmsu/daily/ubuntuはUbuntu派生のものでのみ動作するはずです。grep -R tmsu（ @ sagargel コメント）の出力から、PPAは/etc/apt/sources.list.dの下にまだ存在します。手動で削除する必要があります。

Sudo rm -i /etc/apt/sources.list.d/tmsu-ubuntu-daily-artful.list
Sudo apt update
3
GAD3R