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First clear apt cache sudo apt-get autoclean Backup all sources list files. sudo cp -a /etc/apt/sources.list /etc/apt/sources.list_backup sudo cp -a /etc/apt/sources.list.d/ /etc/apt/sources.list.d_backup Clear faulty sources.list and remove its files. sudo rm -f /etc/apt/sources.list sudo rm -rf /etc/apt/sources.list.d/* Create new ...


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Copied from source https://wiki.ubuntu.com/SecurityTeam/FAQ Why does update-manager no longer prompt for the user's password? As of Ubuntu 11.10, update-manager no longer prompts for the user's password to apply updates. This was decided to improve usability and to make it easier for users to apply security updates and therefore increase ...


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Try sudo -E apt-get update. For some reason this is required. Also the software center will not work cause I don't know how to open the software centre with sudo -E enabled...


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I think your original guess was right. 15.04 is supported through 2016-02-04, so I believe do-release-upgrade is trying to upgrade you to the next supported release compared to the one you have. Edit: Adding more detail. Here's the description of normal upgrade prompting mode from /etc/update-manager/release-upgrades: Check to see if a new release is ...


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You might need to do a clean install. First, back up all of your files. Next, insert an Ubuntu DVD/USB into your computer and boot to it. Finally, go through the installation process and you should be good.


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Run the following commands to fix the issue and the post any errors. First, run the following: sudo dpkg --configure -a Then, run the following: sudo apt-get update sudo apt-get dist-upgrade If that doesn't work, run: sudo apt-get -f install sudo apt-get dist-upgrade Again, please post any errors. Thanks!


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I had the problem too, it was the Multiverse repository that had been unselected - by an upgrade to 15.10 try checking Software and Upgrades settings! After restoring the checkmarks, and doing the mandatory sudo apt-get update sudo apt-get upgrade It installed the software bar 2 PPA's I had to fix under the Other Software tab to the right!



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