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I am getting this error whenever I install any package from the terminal. What is wrong?

apt-get install gnome-tweak-tool
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package gnome-tweak-tool 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 'gnome-tweak-tool' has no installation candidate
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it's because the package name is incorrect! That's what that message means. try sudo apt-get install htop –  Alvar Mar 19 '14 at 13:17
What version of Ubuntu are you using? Is this the only package which produces this error? @Alvar That's the correct name for GNOME Tweak Tool's package :-) –  edwin Mar 19 '14 at 13:18
You can also download gnome-tweak-tool.deb file from here: pkgs.org/download/gnome-tweak-tool –  4M01 Mar 19 '14 at 13:22
Try to review/reset your sources list, then run 'apt-get update' before checking again –  Ahmadgeo Mar 19 '14 at 14:28
What version of Ubuntu are you using? –  Alvar Mar 19 '14 at 14:58

1 Answer 1

Use the command sequence below, to reset your APT-GET sources list

sudo -i
apt-get clean
cd /var/lib/apt
mv lists lists.old
mkdir -p lists/partial
apt-get clean
apt-key update
apt-get update
apt-get install gnome-tweak-tool
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What will this do and why would it help? –  Alvar Mar 19 '14 at 14:59
This will reset your APT-GET sources list. –  byaruhaf Mar 19 '14 at 15:01
No it doesn't. The package source list is located in /etc/apt/. /var/lib/apt/lists holds the lists of known packages retrieved from all configured sources during the last apt-get update. It may help to delete that in some rare circumstances and has no important adverse effects, but usually apt-get update is enough. All the other things you mention aside from rm -rf /var/lib/apt/lists && mkdir -p /var/lib/apt/lists/partial && apt-get update are unnecessary voodoo in relation to OP's issue. –  David Foerster Oct 26 '14 at 14:32

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