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When I click on it and select Mark for Installation a list of packages to be installed is shown which are the following:

libhardware2
libhybris
libhybris-common1
libmedia1
libqt.5position5
oxideqt-codecs
qml-module-qt-labs-settings
qml-module-ubuntu-onlineaccounts
qtdeclarative5-accounts-plugin

I press Mark then I press Apply. I get an error saying Could not apply changes! Fix broken packages first. Then I go to the list of Broken packages and unity-tweak-tool is there. And when I run Fix Broken Packages I get error saying I have held packages but when I run apt-mark showhold it doesn't show anything.

I've installed unity-tweak-tool before and did some changes. And the changes are still here. As I remember, I pressed reset and the UI broke down (I installed a theme using unity-tweak-tool).

I also tried running sudo apt-get purge --auto-remove unity-tweak-tool but it says that it is not installed.

EDIT: What I mean with the changes are still here is the Horizontal Fold effect on Maximize not sure if that is the default or what but any other changes I did using unity-tweak-tool is gone. The themes and stuff.

EDIT 2: This is my very first time trying out Ubuntu (also my very first Linux experience).

EDIT 3: The feature Minimize on click is also still here which I think can only be enabled from unity-tweak-tool.

EDIT 4: There's also this red exclamation mark beside the package name after I select Mark for Installation

Dev
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1 Answers1

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That is because you have broken packages. And the changes applied via tweak tool will remain even if the tool is removed. Also the unity tweak tool has been removed from the system during the update or during installing another package.

You can do couple of things.

1) Run 

sudo apt-get install -f

see if that fixes.

If it does not,

2) Did you install any updates recently or any new software using some ppa? Then remove that ppa or any other unwanted ppas using

sudo apt-get install ppa-purge
sudo ppa-purge ppa:yourppaname/here

3) Then run 

sudo apt-get install -f
sudo apt autoremove
sudo apt-get install unity-tweak-tool
  • I didn't use ppa-purge because I don't know what to put after it so I just removed the repositories from Software and Updates. sudo apt-get install unity-tweak-tool was not enough. I used sudo aptitude install unity-tweak-tool and it offered some solutions to install missing dependencies and so I did. Nonetheless, your answer helped me. – Dev Dec 26 '16 at 09:40
  • You did a mistake. Doing ppa-purge will not only remove ppas but also downgrade dependencies, remove unnecessary packages and does a lot more. See here to see what I am talking about: http://askubuntu.com/questions/862706/how-to-fix-broken-packages-in-this-specific-situation/862775#862775 I faced the same issue and ppa-purge saved me. –  Dec 26 '16 at 10:26
  • I used apt-cache policy command ot list all ppa repositories and from there I don't know what snippet to put in ppa:no-idea-what-to-put-here that's why I used the Software and Updates > Other Software. Nevertheless unity-tweak-tool is already working. And I've also noticed that installing gnome-tweak-tool will replace it. – Dev Dec 26 '16 at 10:38