所以我正准备升级到 ubuntu 15.04，我正在经历并清理一些东西，这是对我来说很突出的事情之一。
W: Duplicate sources.list entry http://download.opensuse.org/repositories/home:/p_conrad:/coins/xUbuntu_14.10/ Packages (/var/lib/apt/lists/download.opensuse.org_repositories_home:_p%5fconrad:_coins_xUbuntu%5f14.10_Packages)
W: You may want to run apt-get update to correct these problems
现在更新什么sudo apt-get update也没做，所以我进入 vim 尝试看看是否可以删除引用。我没有发现任何东西，但这是目录的内容。
archive.canonical.com_ubuntu_dists_utopic_partner_binary-amd64_Packages security.ubuntu.com_ubuntu_dists_vivid-security_restricted_source_Sources
archive.canonical.com_ubuntu_dists_utopic_partner_binary-i386_Packages security.ubuntu.com_ubuntu_dists_vivid-security_universe_binary-amd64_Packages
archive.canonical.com_ubuntu_dists_utopic_partner_i18n_Translation-en security.ubuntu.com_ubuntu_dists_vivid-security_universe_binary-i386_Packages
archive.canonical.com_ubuntu_dists_utopic_partner_source_Sources security.ubuntu.com_ubuntu_dists_vivid-security_universe_i18n_Translation-en
archive.canonical.com_ubuntu_dists_utopic_Release security.ubuntu.com_ubuntu_dists_vivid-security_universe_source_Sources
archive.canonical.com_ubuntu_dists_utopic_Release.gpg us.archive.ubuntu.com_ubuntu_dists_utopic-backports_main_binary-amd64_Packages
archive.canonical.com_ubuntu_dists_vivid_partner_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_utopic-backports_main_binary-i386_Packages
archive.canonical.com_ubuntu_dists_vivid_partner_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_utopic-backports_main_i18n_Translation-en
archive.canonical.com_ubuntu_dists_vivid_partner_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_utopic-backports_main_source_Sources
archive.canonical.com_ubuntu_dists_vivid_partner_source_Sources us.archive.ubuntu.com_ubuntu_dists_utopic-backports_multiverse_binary-amd64_Packages
archive.canonical.com_ubuntu_dists_vivid_Release us.archive.ubuntu.com_ubuntu_dists_utopic-backports_multiverse_binary-i386_Packages
archive.canonical.com_ubuntu_dists_vivid_Release.gpg us.archive.ubuntu.com_ubuntu_dists_utopic-backports_multiverse_i18n_Translation-en
download.opensuse.org_repositories_home:_p%5fconrad:_coins_xUbuntu%5f14.10_Packages us.archive.ubuntu.com_ubuntu_dists_utopic-backports_multiverse_source_Sources
download.opensuse.org_repositories_home:_p%5fconrad:_coins_xUbuntu%5f14.10_Release us.archive.ubuntu.com_ubuntu_dists_utopic-backports_Release
download.opensuse.org_repositories_home:_p%5fconrad:_coins_xUbuntu%5f14.10_Release.gpg us.archive.ubuntu.com_ubuntu_dists_utopic-backports_Release.gpg
现在，这就是我认为我应该寻找的内容，但这看起来并不具有重复项。
download.videolan.org_pub_debian_stable_Packages us.archive.ubuntu.com_ubuntu_dists_utopic-backports_restricted_binary-amd64_Packages
download.videolan.org_pub_debian_stable_Release us.archive.ubuntu.com_ubuntu_dists_utopic-backports_restricted_binary-i386_Packages
download.videolan.org_pub_debian_stable_Release.gpg us.archive.ubuntu.com_ubuntu_dists_utopic-backports_restricted_i18n_Translation-en
download.videolan.org_pub_debian_stable_Sources us.archive.ubuntu.com_ubuntu_dists_utopic-backports_restricted_source_Sources
extras.ubuntu.com_ubuntu_dists_utopic_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_utopic-backports_universe_binary-amd64_Packages
extras.ubuntu.com_ubuntu_dists_utopic_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_utopic-backports_universe_binary-i386_Packages
extras.ubuntu.com_ubuntu_dists_utopic_main_source_Sources us.archive.ubuntu.com_ubuntu_dists_utopic-backports_universe_i18n_Translation-en
extras.ubuntu.com_ubuntu_dists_utopic_Release us.archive.ubuntu.com_ubuntu_dists_utopic-backports_universe_source_Sources
extras.ubuntu.com_ubuntu_dists_utopic_Release.gpg us.archive.ubuntu.com_ubuntu_dists_utopic_main_binary-amd64_Packages
liveusb.info_multisystem_depot_dists_all_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_utopic_main_binary-i386_Packages
liveusb.info_multisystem_depot_dists_all_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_utopic_main_i18n_Translation-en
liveusb.info_multisystem_depot_dists_all_Release us.archive.ubuntu.com_ubuntu_dists_utopic_main_source_Sources
liveusb.info_multisystem_depot_dists_all_Release.gpg us.archive.ubuntu.com_ubuntu_dists_utopic_multiverse_binary-amd64_Packages
lock us.archive.ubuntu.com_ubuntu_dists_utopic_multiverse_binary-i386_Packages
partial us.archive.ubuntu.com_ubuntu_dists_utopic_multiverse_i18n_Translation-en
ppa.launchpad.net_i-nex-development-team_stable_ubuntu_dists_utopic_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_utopic_multiverse_source_Sources
ppa.launchpad.net_i-nex-development-team_stable_ubuntu_dists_utopic_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_utopic_Release
ppa.launchpad.net_i-nex-development-team_stable_ubuntu_dists_utopic_Release us.archive.ubuntu.com_ubuntu_dists_utopic_Release.gpg
ppa.launchpad.net_i-nex-development-team_stable_ubuntu_dists_utopic_Release.gpg us.archive.ubuntu.com_ubuntu_dists_utopic_restricted_binary-amd64_Packages
ppa.launchpad.net_kubuntu-ppa_backports_ubuntu_dists_utopic_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_utopic_restricted_binary-i386_Packages
ppa.launchpad.net_kubuntu-ppa_backports_ubuntu_dists_utopic_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_utopic_restricted_i18n_Translation-en
ppa.launchpad.net_kubuntu-ppa_backports_ubuntu_dists_utopic_main_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_utopic_restricted_source_Sources
ppa.launchpad.net_kubuntu-ppa_backports_ubuntu_dists_utopic_Release us.archive.ubuntu.com_ubuntu_dists_utopic_universe_binary-amd64_Packages
ppa.launchpad.net_kubuntu-ppa_backports_ubuntu_dists_utopic_Release.gpg us.archive.ubuntu.com_ubuntu_dists_utopic_universe_binary-i386_Packages
ppa.launchpad.net_kubuntu-ppa_next-backports_ubuntu_dists_utopic_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_utopic_universe_i18n_Translation-en
ppa.launchpad.net_kubuntu-ppa_next-backports_ubuntu_dists_utopic_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_utopic_universe_source_Sources
ppa.launchpad.net_kubuntu-ppa_next-backports_ubuntu_dists_utopic_main_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_utopic-updates_main_binary-amd64_Packages
ppa.launchpad.net_kubuntu-ppa_next-backports_ubuntu_dists_utopic_Release us.archive.ubuntu.com_ubuntu_dists_utopic-updates_main_binary-i386_Packages
ppa.launchpad.net_kubuntu-ppa_next-backports_ubuntu_dists_utopic_Release.gpg us.archive.ubuntu.com_ubuntu_dists_utopic-updates_main_i18n_Translation-en
ppa.launchpad.net_n-muench_vlc_ubuntu_dists_utopic_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_utopic-updates_main_source_Sources
ppa.launchpad.net_n-muench_vlc_ubuntu_dists_utopic_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_utopic-updates_multiverse_binary-amd64_Packages
ppa.launchpad.net_n-muench_vlc_ubuntu_dists_utopic_main_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_utopic-updates_multiverse_binary-i386_Packages
ppa.launchpad.net_n-muench_vlc_ubuntu_dists_utopic_Release us.archive.ubuntu.com_ubuntu_dists_utopic-updates_multiverse_i18n_Translation-en
ppa.launchpad.net_n-muench_vlc_ubuntu_dists_utopic_Release.gpg us.archive.ubuntu.com_ubuntu_dists_utopic-updates_multiverse_source_Sources
ppa.launchpad.net_noobslab_indicators_ubuntu_dists_utopic_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_utopic-updates_Release
ppa.launchpad.net_noobslab_indicators_ubuntu_dists_utopic_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_utopic-updates_Release.gpg
ppa.launchpad.net_noobslab_indicators_ubuntu_dists_utopic_Release us.archive.ubuntu.com_ubuntu_dists_utopic-updates_restricted_binary-amd64_Packages
ppa.launchpad.net_noobslab_indicators_ubuntu_dists_utopic_Release.gpg us.archive.ubuntu.com_ubuntu_dists_utopic-updates_restricted_binary-i386_Packages
ppa.launchpad.net_otto-kesselgulasch_gimp_ubuntu_dists_utopic_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_utopic-updates_restricted_i18n_Translation-en
ppa.launchpad.net_otto-kesselgulasch_gimp_ubuntu_dists_utopic_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_utopic-updates_restricted_source_Sources
ppa.launchpad.net_otto-kesselgulasch_gimp_ubuntu_dists_utopic_main_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_utopic-updates_universe_binary-amd64_Packages
ppa.launchpad.net_otto-kesselgulasch_gimp_ubuntu_dists_utopic_Release us.archive.ubuntu.com_ubuntu_dists_utopic-updates_universe_binary-i386_Packages
ppa.launchpad.net_otto-kesselgulasch_gimp_ubuntu_dists_utopic_Release.gpg us.archive.ubuntu.com_ubuntu_dists_utopic-updates_universe_i18n_Translation-en
ppa.launchpad.net_spring_ppa_ubuntu_dists_utopic_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_utopic-updates_universe_source_Sources
ppa.launchpad.net_spring_ppa_ubuntu_dists_utopic_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-backports_main_binary-amd64_Packages
ppa.launchpad.net_spring_ppa_ubuntu_dists_utopic_main_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_vivid-backports_main_binary-i386_Packages
ppa.launchpad.net_spring_ppa_ubuntu_dists_utopic_Release us.archive.ubuntu.com_ubuntu_dists_vivid-backports_main_i18n_Translation-en
ppa.launchpad.net_spring_ppa_ubuntu_dists_utopic_Release.gpg us.archive.ubuntu.com_ubuntu_dists_vivid-backports_main_source_Sources
ppa.launchpad.net_ubuntu-wine_ppa_ubuntu_dists_utopic_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-backports_multiverse_binary-amd64_Packages
ppa.launchpad.net_ubuntu-wine_ppa_ubuntu_dists_utopic_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-backports_multiverse_binary-i386_Packages
ppa.launchpad.net_ubuntu-wine_ppa_ubuntu_dists_utopic_main_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_vivid-backports_multiverse_i18n_Translation-en
ppa.launchpad.net_ubuntu-wine_ppa_ubuntu_dists_utopic_Release us.archive.ubuntu.com_ubuntu_dists_vivid-backports_multiverse_source_Sources
ppa.launchpad.net_ubuntu-wine_ppa_ubuntu_dists_utopic_Release.gpg us.archive.ubuntu.com_ubuntu_dists_vivid-backports_Release
ppa.launchpad.net_webupd8team_tor-browser_ubuntu_dists_utopic_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-backports_Release.gpg
ppa.launchpad.net_webupd8team_tor-browser_ubuntu_dists_utopic_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-backports_restricted_binary-amd64_Packages
ppa.launchpad.net_webupd8team_tor-browser_ubuntu_dists_utopic_main_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_vivid-backports_restricted_binary-i386_Packages
ppa.launchpad.net_webupd8team_tor-browser_ubuntu_dists_utopic_Release us.archive.ubuntu.com_ubuntu_dists_vivid-backports_restricted_i18n_Translation-en
ppa.launchpad.net_webupd8team_tor-browser_ubuntu_dists_utopic_Release.gpg us.archive.ubuntu.com_ubuntu_dists_vivid-backports_restricted_source_Sources
ppa.launchpad.net_wfg_0ad_ubuntu_dists_utopic_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-backports_universe_binary-amd64_Packages
ppa.launchpad.net_wfg_0ad_ubuntu_dists_utopic_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-backports_universe_binary-i386_Packages
ppa.launchpad.net_wfg_0ad_ubuntu_dists_utopic_main_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_vivid-backports_universe_i18n_Translation-en
ppa.launchpad.net_wfg_0ad_ubuntu_dists_utopic_Release us.archive.ubuntu.com_ubuntu_dists_vivid-backports_universe_source_Sources
ppa.launchpad.net_wfg_0ad_ubuntu_dists_utopic_Release.gpg us.archive.ubuntu.com_ubuntu_dists_vivid_main_binary-amd64_Packages
ppa.launchpad.net_xorg-edgers_ppa_ubuntu_dists_utopic_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_vivid_main_binary-i386_Packages
ppa.launchpad.net_xorg-edgers_ppa_ubuntu_dists_utopic_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_vivid_main_i18n_Translation-en
ppa.launchpad.net_xorg-edgers_ppa_ubuntu_dists_utopic_main_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_vivid_main_source_Sources
ppa.launchpad.net_xorg-edgers_ppa_ubuntu_dists_utopic_Release us.archive.ubuntu.com_ubuntu_dists_vivid_multiverse_binary-amd64_Packages
ppa.launchpad.net_xorg-edgers_ppa_ubuntu_dists_utopic_Release.gpg us.archive.ubuntu.com_ubuntu_dists_vivid_multiverse_binary-i386_Packages
security.ubuntu.com_ubuntu_dists_utopic-security_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_vivid_multiverse_i18n_Translation-en
security.ubuntu.com_ubuntu_dists_utopic-security_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_vivid_multiverse_source_Sources
security.ubuntu.com_ubuntu_dists_utopic-security_main_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_vivid_Release
security.ubuntu.com_ubuntu_dists_utopic-security_main_source_Sources us.archive.ubuntu.com_ubuntu_dists_vivid_Release.gpg
security.ubuntu.com_ubuntu_dists_utopic-security_multiverse_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_vivid_restricted_binary-amd64_Packages
security.ubuntu.com_ubuntu_dists_utopic-security_multiverse_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_vivid_restricted_binary-i386_Packages
security.ubuntu.com_ubuntu_dists_utopic-security_multiverse_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_vivid_restricted_i18n_Translation-en
security.ubuntu.com_ubuntu_dists_utopic-security_multiverse_source_Sources us.archive.ubuntu.com_ubuntu_dists_vivid_restricted_source_Sources
security.ubuntu.com_ubuntu_dists_utopic-security_Release us.archive.ubuntu.com_ubuntu_dists_vivid_universe_binary-amd64_Packages
security.ubuntu.com_ubuntu_dists_utopic-security_Release.gpg us.archive.ubuntu.com_ubuntu_dists_vivid_universe_binary-i386_Packages
security.ubuntu.com_ubuntu_dists_utopic-security_restricted_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_vivid_universe_i18n_Translation-en
security.ubuntu.com_ubuntu_dists_utopic-security_restricted_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_vivid_universe_source_Sources
security.ubuntu.com_ubuntu_dists_utopic-security_restricted_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_vivid-updates_main_binary-amd64_Packages
security.ubuntu.com_ubuntu_dists_utopic-security_restricted_source_Sources us.archive.ubuntu.com_ubuntu_dists_vivid-updates_main_binary-i386_Packages
security.ubuntu.com_ubuntu_dists_utopic-security_universe_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-updates_main_i18n_Translation-en
security.ubuntu.com_ubuntu_dists_utopic-security_universe_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-updates_main_source_Sources
security.ubuntu.com_ubuntu_dists_utopic-security_universe_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_vivid-updates_multiverse_binary-amd64_Packages
security.ubuntu.com_ubuntu_dists_utopic-security_universe_source_Sources us.archive.ubuntu.com_ubuntu_dists_vivid-updates_multiverse_binary-i386_Packages
security.ubuntu.com_ubuntu_dists_vivid-security_main_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-updates_multiverse_i18n_Translation-en
security.ubuntu.com_ubuntu_dists_vivid-security_main_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-updates_multiverse_source_Sources
security.ubuntu.com_ubuntu_dists_vivid-security_main_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_vivid-updates_Release
security.ubuntu.com_ubuntu_dists_vivid-security_main_source_Sources us.archive.ubuntu.com_ubuntu_dists_vivid-updates_Release.gpg
security.ubuntu.com_ubuntu_dists_vivid-security_multiverse_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-updates_restricted_binary-amd64_Packages
security.ubuntu.com_ubuntu_dists_vivid-security_multiverse_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-updates_restricted_binary-i386_Packages
security.ubuntu.com_ubuntu_dists_vivid-security_multiverse_i18n_Translation-en us.archive.ubuntu.com_ubuntu_dists_vivid-updates_restricted_i18n_Translation-en
security.ubuntu.com_ubuntu_dists_vivid-security_multiverse_source_Sources us.archive.ubuntu.com_ubuntu_dists_vivid-updates_restricted_source_Sources
security.ubuntu.com_ubuntu_dists_vivid-security_Release us.archive.ubuntu.com_ubuntu_dists_vivid-updates_universe_binary-amd64_Packages
security.ubuntu.com_ubuntu_dists_vivid-security_Release.gpg us.archive.ubuntu.com_ubuntu_dists_vivid-updates_universe_binary-i386_Packages
security.ubuntu.com_ubuntu_dists_vivid-security_restricted_binary-amd64_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-updates_universe_i18n_Translation-en
security.ubuntu.com_ubuntu_dists_vivid-security_restricted_binary-i386_Packages us.archive.ubuntu.com_ubuntu_dists_vivid-updates_universe_source_Sources
security.ubuntu.com_ubuntu_dists_vivid-security_restricted_i18n_Translation-en
现在，我安装了这个：sudo apt-get install nfs-kernel-server
从这里：https://askubuntu.com/questions/583279/unable-to- Correct-problems-you-have-held-broken-packages-while-installing-nfs-s
答案1
重复source.list条目并不是一个大问题，只是对性能造成一点影响。
该消息具有误导性：apt-get update单独使用并不能消除重复的条目。您需要编辑source.list文件：/etc/apt/sources.list和 中的文件/etc/apt/sources.list.d。查找错误消息中提到的存储库条目并删除重复项之一。然后跑步apt-get update。
答案2
我将首先手动尝试此处的说明：如何在 /etc/apt/sources.list 中添加一行？
这是我编辑的方式：
$ ls /etc/apt
apt.conf.d preferences preferences.d sources.list sources.list.d sources.list.save trustdb.gpg trusted.gpg trusted.gpg~ trusted.gpg.d
$ vi /etc/apt/sources.list
这里有更多信息：https://wiki.debian.org/SourcesList
一旦您了解了其工作原理，我将尝试使用此处的软件生成替换sources.list文件：http://repogen.simplylinux.ch/。