Reading package lists...
Building dependency tree...
Reading state information...
Package rsync is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'rsync' has no installation candidate
ERROR: Job failed: exit code 1

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:
 imagemagick : Depends: imagemagick-6.q16 (>= 8:6.9.2.10+dfsg-2~) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
ERROR: Job failed: exit code 1