I searched for and ran the following command.

sudo apt-get update; sudo apt-get --purge --reinstall install software-center software-properties-common software-properties-gtk

But I still don't have software center. I got this error...

Reading package lists... Done
E: Failed to fetch "//mirrors.sonic.net/ubuntu/dists/zesty-updates/universe/source/Sources"  404  Not Found
E: Failed to fetch "//mirrors.sonic.net/ubuntu/dists/zesty-backports/main/source/Sources"  404  Not Found
E: Failed to fetch "//mirrors.sonic.net/ubuntu/dists/zesty-security/restricted/source/Sources"  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package software-center is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'software-center' has no installation candidate
  • What are you trying to achieve with these commands? Giving us some context would be great.
    – edwinksl
    Aug 23, 2017 at 3:01
  • The title of the thread explains what I want to achieve.
    – J.Doe
    Aug 23, 2017 at 3:04
  • 3
    In Zesty, there is no package for Software-center in the Ubuntu package archives. There is a gnome-software, ubuntu-software, lubuntu-software-center and ubuntu-kylin-software-center - perhaps one of these is what you are looking for? Aug 23, 2017 at 3:38
  • If you don't understand the Q: why do you feel the need to reply?
    – J.Doe
    Aug 24, 2017 at 1:10

1 Answer 1


It seems that the repository you use has take down all three repositories. I checked their ftp servers, and these three are not present at all.


So, you will receive 404 Not Found error when attempting to connect to these repositories.

It is adviced that you change your repositories in Ubuntu Settings --> Software and Updates --> Ubuntu Software and under Download from: choose Ubuntu's Main Server or Server from your country.


Or, you can open a new terminal, enter root and type sudo nano /etc/apt/sources.list. You will see something like this:

# sources.list
# deb cdrom:[Ubuntu 17.04 _zesty zapus_ - Release i386 (201xxxxx.x)]/ zesty main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://mirrors.sonic.net/ubuntu/ zesty main restricted
deb-src http://mirrors.sonic.net/ubuntu/ zesty main restricted

Change all mirrors.sonic.net into archive.ubuntu.com.

After so, run sudo apt-get update; sudo apt-get install gnome-software and that should work fine now.

(Update: Zesty do not use software-center anymore, use gnome-software or ubuntu-software instead.)

If you know what other packages you are trying to install, you can use Synaptic Package Manager or directly use apt-get to install the packages you want.

  • Thank you for your feed back Cynplytholowazy ! The software the image in your reply portrays "Software and Updates" is no longer listed in my Ubuntu system settings. This is the package I need to reinstall. I have searched and tried numerous sudo commands with no success.
    – J.Doe
    Aug 24, 2017 at 1:04

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