When I try to install unity tweak tool with
sudo apt-get install unity-tweak-tool
the output is
Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: unity-tweak-tool : Depends: unity-webapps-common but it is not going to be installed E: Unable to correct problems, you have held broken packages.
I tried Synaptic and Ubuntu software center also. I have Ubuntu 16.04 LTS.