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After running those two commands:

sudo add-apt-repository ppa:tualatrix/next
sudo apt-get update

I am getting this output:

Reading package lists... Done
W: The repository 'ppa.launchpad.net/tualatrix/next/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch ppa.launchpad.net/tualatrix/next/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
E: Failed to fetch ppa.launchpad.net/tualatrix/next/ubuntu/dists/xenial/main/binary-i386/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

I don't really understand the error in the last few lines. (Had to remove the http: before the ppa (no more then 2 Links...)

If I dismiss these errors.

The installation of ubuntu-tweak does not work

sudo apt-get install ubuntu-tweak

This output:

niclas@ThinkPad:~$ sudo apt-get install ubuntu-tweak
[sudo] password for niclas: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package ubuntu-tweak

Would be thankfull for any help

Danibix
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Niclas
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2 Answers2

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use this repository

sudo add-apt-repository ppa:tualatrix/ppa
Rarda
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If you don't succeed to install Ubuntu tweak from ppa, you can install it from debian package (.deb) following these steps:

  1. Download package from Ubuntu Tweak website.

  2. Open terminal and change your working directory where you downloaded the file (e.g Download directory).

    cd Download

  3. Now you can install Ubuntu Tweak with this command:

    sudo dpkg -i <package>

    (change <package> with .deb name, e.g. ubuntu-tweak_0.8.7-1-trusty2_all.deb)

You can get more info about dpkg command reading manual with this command:

man dpkg

I hope this could help you.

EDIT:
If your error is caused by some missing packages you can try to solve it with the following command that will fix package dependencies:

sudo apt-get install -f

After this you can try to reinstall Ubuntu-tweak.

If previous solution doesn't work, it could means that Ubuntu Tweak package could be not ready for Ubuntu 16.04, since last update was made two years ago. I didn't find any information about compatibility with Ubuntu 16.04 neither on ubuntu wiki nor on official website. Hence I suggest to you to wait for a while and see if it will be released a new version.

Meanwhile you can try to install unity-tweak-tool. It is a similar program that let you tweak some aspects of Unity. There isn't an Apps manager or Janitor, but if you only want to change appearance you can use it. You can install it with this command:

sudo apt-get install unity-tweak-tool
Danibix
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  • If I try that I am getting this error in the end: Errors were encountered while processing: ubuntu-tweak – Niclas Apr 20 '16 at 11:06
  • Is it possible that ubuntu tweak doesn'w work yet with 16.04? – Niclas Apr 20 '16 at 11:08
  • @Niclas - that might be it. – grooveplex Apr 20 '16 at 11:57
  • Okay so I am now using unity tweak tool. That one is working fine. ( installed over software center) – Niclas Apr 20 '16 at 13:24
  • But I still had the problem that some repositorys does not seem to work. Even simple things like themes wouldn't be installed. Might be caused by 16.04 just aswell... – Niclas Apr 20 '16 at 13:26
  • @Niclas You can try to install `Numix` theme from its `ppa`. Watch the answer of this post http://askubuntu.com/questions/640608/how-to-fix-numix-theme-on-ubuntu-14-04 I am almost sure that works also on Ubuntu 16.04 – Danibix Apr 20 '16 at 13:34
  • Numix worked but sth like Flatabulous didn't work :S – Niclas Apr 20 '16 at 14:03