```
The following packages have unmet dependencies:
 pyqt5-dev-tools : Depends: python3-pyqt5 (= 5.2.1+dfsg-1ubuntu1) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
The command "sudo apt-get install pyqt5-dev-tools" failed and exited with 100 during .
```