```
$ sudo apt install linuxcnc-uspace
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:
 linuxcnc-uspace : Depends: libboost-python1.62.0 but it is not installable
                   Depends: python2.7-imaging but it is not installable or
                            python-imaging but it is not installable
                   Recommends: linuxcnc-doc-en but it is not going to be installed or
                               linuxcnc-doc
                   Recommends: hostmot2-firmware-all but it is not installable
                   Recommends: linux-image-rt-amd64 but it is not installable
E: Unable to correct problems, you have held broken packages.
```