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N: See apt-secure(8) manpage for repository creation and user configuration details." There are not as many errors as in my previous installation and when I run apt-get dist-upgrade every thing runs successfully. Try installing 17.10 then immediately issue apt-get update, before any other commands. Libreoffice is a fantastic open source free office suite for Linux, Windows and Mac users, but have you ever come across the problem of updating the version since there is always new version coming and there is no auto-update feature available yet.W: Target Sources (universe/source/Sources) is configured multiple times in /etc/apt/sources.list:47 and /etc/apt/sources.list:49 W: Target Sources (multiverse/source/Sources Hi, I have tidied it up as much as I can see - I don't think you can get it any simpler unless you remove stuff, but don't go there. Done E: The repository ' artful Release' does not have a Release file.

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deb artful multiverse # deb-src artful multiverse deb artful-updates multiverse # deb-src artful-updates multiverse ## N. 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.I run sudo apt-get autoremove and i got this message eading package lists...Done Building dependency tree Reading state information...Done W: GPG error: https://dl.winehq.org/wine-builds/ubuntu artful In Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 818A435C5FCBF54A E: The repository 'https://dl.winehq.org/wine-builds/ubuntu artful In Release' is not signed. Be good if you open a ticket on Launchpad about this, including the image link of your download your fix.

N: Updating from such a repository can't be done securely, and is therefore disabled by default. This sounds like a very broken image, which should be fixed by Ubuntu.

N: Updating from such a repository can't be done securely, and is therefore disabled by default. This is what I have done so far and the list of errors has decreased, but there are still some.

N: See apt-secure(8) manpage for repository creation and user configuration details. Please see below commands sudo apt-get clean && sudo apt-get update && sudo apt-get upgrade sudo apt-get dist-upgrade sudo cp old sudo cp -r d sources,list.sudo rm /ect/apt/d/* sudo apt-get update && sudo apt-get upgrade sudo apt-get update && sudo apt-get dist-upgrade Err:1 artful In Release Could not resolve 'us.old-releases.ubuntu.com' Ign:4 artful In Release Ign:5 artful-security In Release Err:6 artful Release 404 Not Found Err:7 artful-security Release 404 Not Found Err:8 https://http///bin/linux/ubuntu In Release Could not resolve 'http' Reading package lists...

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: The repository ' artful Release' no longer has a Release file.