[Koha] upgrade to Koha 18.11 on Ubuntu 18.04

[Giuseppe Angilella]

Hi,

I have a (working) instance of Koha 17.11.05-1 installed on an Ubuntu 
18.01.1 LTS (bionic) machine. I would like to upgrade Koha to the current 
version 18.11.01-1, but I get the error:

sudo apt upgrade koha-common

Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  koha-common : Depends: libhttp-oai-perl (< 4.0) but 4.06-1 is to be installed or
                         libhttp-oai-3.27-perl but it is not going to be installed
E: Broken packages

Any hint on how to resolve my problem?

Many thanks in advance and best regards,

Giuseppe.