Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following extra packages will be installed:
  repowerd-data
The following packages will be upgraded:
  repowerd-data
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
4 not fully installed or removed.
Need to get 0 B/5,098 B of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] 
(Reading database ... 47958 files and directories currently installed.)
Preparing to unpack .../repowerd-data_2016.08.2+15.04.20160823.1-0ubuntu1_all.deb ...
Unpacking repowerd-data (2016.08.2+15.04.20160823.1-0ubuntu1) over (2016.08.1+15.04.20160817.1-0ubuntu1) ...
dpkg: error processing archive /var/cache/apt/archives/repowerd-data_2016.08.2+15.04.20160823.1-0ubuntu1_all.deb (--unpack):
 unable to make backup link of `./usr/share/powerd/device_configs/config-default.xml' before installing new version: Invalid cross-device link
Errors were encountered while processing:
 /var/cache/apt/archives/repowerd-data_2016.08.2+15.04.20160823.1-0ubuntu1_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)