Update with workaround:
If you run
sudo apt-get install boxbackup-server
And just reply on the two prompts with just pressing the key and
then when the installation is complete run
sudo dpkg-reconfigure boxbackup-server
It actually seams like the package is installed :-)
--
package boxbackup
I can confirm that this bug is still present in 8.10, see the output
from apt-get install boxbackup-server
ja...@sp13k:~$ sudo apt-get install boxbackup-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be install