root@deb9-rpm:~# apt-get upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
  openlitespeed
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/5,432 kB of archives.
After this operation, 676 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Reading changelogs... Done
(Reading database ... 31723 files and directories currently installed.)
Preparing to unpack .../openlitespeed_1.4.35-1+stretch_amd64.deb ...
Unpacking openlitespeed (1.4.35-1+stretch) over (1.4.34-1+stretch) ...
Setting up openlitespeed (1.4.35-1+stretch) ...
Configuration file '/usr/local/lsws/conf/httpd_config.conf'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** httpd_config.conf (Y/I/N/O/D/Z) [default=N] ? N
Configuration file '/usr/local/lsws/admin/conf/htpasswd'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** htpasswd (Y/I/N/O/D/Z) [default=N] ? N