root@ubuntu-rsi-controller:~# sudo dpkg -P unifi
(Reading database ... 101068 files and directories currently installed.)
Removing unifi (5.6.30-10266) ...
Purging configuration files for unifi (5.6.30-10266) ...
 Removing any system startup links for /etc/init.d/unifi ...
dpkg: error processing package unifi (--purge):
 subprocess installed post-removal script returned error exit status 128
Errors were encountered while processing:
 unifi
root@ubuntu-rsi-controller:~#