Q:

Shema missing com.canonical.unity.webapps

My unity tweak tool (ubuntu 15.10) stopped working after the last autoremove. Other articles suggest to run sudo apt-get install unity-webapps-service or sudo apt-get install unity-webapps-common. When trying to install it I'm getting an error message :
The following packages have unmet dependencies: 
   unity-webapps-service : Depends: webapp-container
E: Unable to correct problems, you have held broken packages.

Now looking on other questions on this forum and can't find any answer to this fix this problem. When trying to install packages that others suggest getting the same or similar error.
The same problem with package musescroe:
The following packages have unmet dependencies:
 musescore : Depends: qtbase-abi-5-4-2
E: Unable to correct problems, you have held broken packages.

A:

I found the solution. I've added a kubuntu ppa and that was the problem. I tried to instal kde5 from a tutorial for kubuntu. Just check if you don't have something like this in your repos.

