root@uninsinuating-brantley:~# apt upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] 
Setting up opensmtpd (5.4.1p1-1) ...
dpkg: error processing package opensmtpd (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 opensmtpd
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@uninsinuating-brantley:~# apt-get -f install
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up opensmtpd (5.4.1p1-1) ...
dpkg: error processing package opensmtpd (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 opensmtpd
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@uninsinuating-brantley:~#