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3

As we found out in our chat, the problem was due to 11 missing keys and 2 unwanted keys. Remove the unwanted keys (Chromium and Steam) with : sudo apt-key del B05498B7 4E5E17B5 Import the missing keys with : `sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys <all missing keys in the warning>` Update the repositories : sudo apt-get ...


3

Try installing the package software-center with sudo apt install software-center :)


2

I doubt it's the old one. They have the same icon, but the old one is called Ubuntu Software Center, while the new one is called Ubuntu Software. If you have the old one, you'll see something like this: GNOME Software (the new one) looks like: If this is a fresh installation of Ubuntu 16.04, there should be no way you have the old Software Center. ...


2

This behavior is consistent with Ubuntu Software Centre. Canonical works with third-party software providers to provide payment and hosting for commericial software in the partner repository. In Ubuntu 16.04 LTS, this is being replaced by the Ubuntu App Store which powers the snap repository's backend. While the command line tools provide access to ...


2

You can use the Synaptic Package Manager for installing the missing/corrupted packages. Which can be installed from software center or can be installed by running the following commands in the terminal sudo apt-get update sudo apt-get install synaptic


1

You can install the classic "Software Center", which "always" works OK : $ sudo apt-get update && sudo apt-get install synaptic


1

I am also running Ubuntu 16.04 x64 and confirm that both applications you mention appear in Software Centre on my system. The problem could possibly be your software sources. Check the "Software & Updates" screen within "System Settings". The picture below shows how mine currently looks. I believe "Universe" would be required for Unity Tweak Tool. It ...


1

You can remove Ubuntu Software Center manually and if not already installed, install Ubuntu Software instead. Open terminal (CTRL+ALT+T) and execute the following commands: sudo apt-get remove software-center sudo apt-get install ubuntu-software


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There is no uninstaller for MATLAB on UNIX or Linux. To remove MATLAB you simply need to delete the MATLAB installation following the instructions below: If you are running a license manager for MATLAB, shut down the license manager using the lmdown script located in MATLAB's etc directory. If this folder does not exist, you are not running the FlexNet ...


1

Ok, from the description and your added info, I think it is because you are trying Ubuntu(live USB), so not all software repos are enabled. By default, live session only select main and restricted software as below pic: The software you wanted - clementine or synaptic are both in "Community-maintained free and open-source software". So you can enter in ...


1

You are supposed to select the All window, and use the search feature to find the program(s) you consider to install. https://help.ubuntu.com/stable/ubuntu-help/addremove-install.html


1

This is a bug in the new software app. Try using the terminal to install your application with sudo dpkg -i new_app.deb. If you see messages about missing dependencies, than also enter the command sudo apt-get install -f


1

I suggest you to take a look at Take A Break. sudo add-apt-repository ppa:vlijm/takeabreak sudo apt-get update sudo apt-get install takeabreak



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