我的桌面上刚刚安装了 Linux Mint 17.02 Cinnamon，第一次运行时sudo apt-get update它询问我有关干扰文件的问题，但我告诉它出于某种原因跳过一些内容。现在，当我运行时update，它会扫描大量文件，从不说“没有更新文件”或类似的内容。下面是运行 10 次中的 10 次的屏幕截图。输出如下：
matthias@matthias ~ $ sudo apt-get update
Ign http://dl.google.com stable InRelease
Ign http://extra.linuxmint.com rafaela InRelease
Ign http://packages.linuxmint.com rafaela InRelease
Hit http://security.ubuntu.com trusty-security InRelease
Ign http://repo.mongodb.org xenial/mongodb-org/3.2 InRelease
Hit http://extra.linuxmint.com rafaela Release.gpg
Hit http://packages.linuxmint.com rafaela Release.gpg
Hit http://dl.google.com stable Release.gpg
Ign http://repo.mongodb.org xenial/mongodb-org/3.4 InRelease
Hit http://dl.google.com stable Release
Hit http://security.ubuntu.com trusty-security/main amd64 Packages
Hit http://extra.linuxmint.com rafaela Release
Hit http://packages.linuxmint.com rafaela Release
Hit http://security.ubuntu.com trusty-security/restricted amd64 Packages
Ign http://archive.ubuntu.com trusty InRelease
Ign http://ppa.launchpad.net trusty InRelease
Hit http://repo.mongodb.org xenial/mongodb-org/3.2 Release.gpg
Ign http://archive.canonical.com trusty InRelease
Hit http://dl.google.com stable/main amd64 Packages
Hit http://security.ubuntu.com trusty-security/universe amd64 Packages
Hit http://packages.linuxmint.com rafaela/main amd64 Packages
Hit http://extra.linuxmint.com rafaela/main amd64 Packages
Hit http://repo.mongodb.org xenial/mongodb-org/3.4 Release.gpg
Hit http://security.ubuntu.com trusty-security/multiverse amd64 Packages
Hit http://archive.ubuntu.com trusty-updates InRelease
Hit http://packages.linuxmint.com rafaela/upstream amd64 Packages
Hit http://extra.linuxmint.com rafaela/main i386 Packages
Hit http://ppa.launchpad.net trusty InRelease
Hit http://archive.canonical.com trusty Release.gpg
Hit http://security.ubuntu.com trusty-security/main i386 Packages
Hit http://repo.mongodb.org xenial/mongodb-org/3.2 Release
Hit http://security.ubuntu.com trusty-security/restricted i386 Packages
Hit http://packages.linuxmint.com rafaela/import amd64 Packages
Hit http://repo.mongodb.org xenial/mongodb-org/3.4 Release
Hit http://archive.ubuntu.com trusty Release.gpg
Hit http://security.ubuntu.com trusty-security/universe i386 Packages
Hit http://ppa.launchpad.net trusty InRelease
Hit http://archive.canonical.com trusty Release
Hit http://packages.linuxmint.com rafaela/main i386 Packages
Hit http://security.ubuntu.com trusty-security/multiverse i386 Packages
Hit http://repo.mongodb.org xenial/mongodb-org/3.2/multiverse amd64 Packages
Hit http://security.ubuntu.com trusty-security/main Translation-en
Hit http://packages.linuxmint.com rafaela/upstream i386 Packages
Hit http://archive.ubuntu.com trusty-updates/main amd64 Packages
Hit http://ppa.launchpad.net trusty InRelease
Hit http://archive.canonical.com trusty/partner amd64 Packages
Hit http://security.ubuntu.com trusty-security/multiverse Translation-en
Hit http://repo.mongodb.org xenial/mongodb-org/3.2/multiverse i386 Packages
Hit http://packages.linuxmint.com rafaela/import i386 Packages
Hit http://security.ubuntu.com trusty-security/restricted Translation-en
Hit http://archive.ubuntu.com trusty-updates/restricted amd64 Packages
Hit http://security.ubuntu.com trusty-security/universe Translation-en
Hit http://ppa.launchpad.net trusty InRelease
Hit http://archive.canonical.com trusty/partner i386 Packages
Ign http://extra.linuxmint.com rafaela/main Translation-en_US
Hit http://repo.mongodb.org xenial/mongodb-org/3.4/multiverse amd64 Packages
Ign http://extra.linuxmint.com rafaela/main Translation-en
Hit http://archive.ubuntu.com trusty-updates/universe amd64 Packages
Ign http://dl.google.com stable/main Translation-en_US
Hit http://ppa.launchpad.net trusty Release.gpg
Hit http://archive.canonical.com trusty/partner Translation-en
Hit http://repo.mongodb.org xenial/mongodb-org/3.4/multiverse arm64 Packages
Hit http://archive.ubuntu.com trusty-updates/multiverse amd64 Packages
Ign http://dl.google.com stable/main Translation-en
Hit http://ppa.launchpad.net trusty/main Sources
Hit http://archive.ubuntu.com trusty-updates/main i386 Packages
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://archive.ubuntu.com trusty-updates/restricted i386 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://archive.ubuntu.com trusty-updates/universe i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://archive.ubuntu.com trusty-updates/multiverse i386 Packages
Hit http://archive.ubuntu.com trusty-updates/main Translation-en
Hit http://ppa.launchpad.net trusty/main Sources
Hit http://archive.ubuntu.com trusty-updates/multiverse Translation-en
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://archive.ubuntu.com trusty-updates/restricted Translation-en
Ign http://packages.linuxmint.com rafaela/import Translation-en_US
Ign http://repo.mongodb.org xenial/mongodb-org/3.2/multiverse Translation-en_US
Ign http://packages.linuxmint.com rafaela/import Translation-en
Hit http://ppa.launchpad.net trusty/main i386 Packages
Ign http://repo.mongodb.org xenial/mongodb-org/3.2/multiverse Translation-en
Ign http://packages.linuxmint.com rafaela/main Translation-en_US
Hit http://archive.ubuntu.com trusty-updates/universe Translation-en
Ign http://packages.linuxmint.com rafaela/main Translation-en
Ign http://repo.mongodb.org xenial/mongodb-org/3.4/multiverse Translation-en_US
Ign http://repo.mongodb.org xenial/mongodb-org/3.4/multiverse Translation-en
Ign http://packages.linuxmint.com rafaela/upstream Translation-en_US
Hit http://ppa.launchpad.net trusty/main Translation-en
Ign http://packages.linuxmint.com rafaela/upstream Translation-en
Hit http://archive.ubuntu.com trusty Release
Hit http://ppa.launchpad.net trusty/main Sources
Hit http://archive.ubuntu.com trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://archive.ubuntu.com trusty/restricted amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://archive.ubuntu.com trusty/universe amd64 Packages
Hit http://ppa.launchpad.net trusty/main Sources
Hit http://archive.ubuntu.com trusty/multiverse amd64 Packages
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://archive.ubuntu.com trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://archive.ubuntu.com trusty/restricted i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://archive.ubuntu.com trusty/universe i386 Packages
Hit http://ppa.launchpad.net trusty Release
Hit http://archive.ubuntu.com trusty/multiverse i386 Packages
Hit http://ppa.launchpad.net trusty/main Sources
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://archive.ubuntu.com trusty/main Translation-en
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://archive.ubuntu.com trusty/multiverse Translation-en
Hit http://archive.ubuntu.com trusty/restricted Translation-en
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://archive.ubuntu.com trusty/universe Translation-en
Ign http://archive.ubuntu.com trusty/main Translation-en_US
Ign http://archive.ubuntu.com trusty/multiverse Translation-en_US
Ign http://archive.ubuntu.com trusty/restricted Translation-en_US
Ign http://archive.ubuntu.com trusty/universe Translation-en_US
Reading package lists... Done
有没有办法清除设置什么的？我不完全确定为什么会这样做，所以我不知道如何解决它。谢谢
编辑：评论询问 /etc/apt/sources.list 和 /etc/apt/sources/apt.conf 的内容。我没有后者，但这是第一个：
#deb cdrom:[Linux Mint 17.2 _Rafaela_ - Release amd64 20150721]/ .Trash-1000/files/dists.2/xenial/main/binary-i386/
#deb cdrom:[Linux Mint 17.2 _Rafaela_ - Release amd64 20150721]/ .Trash-1000/files/dists.2/xenial/restricted/binary-amd64/
#deb cdrom:[Linux Mint 17.2 _Rafaela_ - Release amd64 20150721]/ .Trash-1000/files/dists.2/xenial/restricted/binary-i386/
#deb cdrom:[Linux Mint 17.2 _Rafaela_ - Release amd64 20150721]/ trusty contrib main non-free
#deb cdrom:[Linux Mint 17.2 _Rafaela_ - Release amd64 20150721]/.Trash-1000/files/ dists.2/xenial/main/binary-amd64/
#deb cdrom:[Linux Mint 17.2 _Rafaela_ - Release amd64 20150721]/.Trash-1000/files/ xenial main restricted