cannot install qgis-server due libxerces-c-3.1.so missing dependency

[marcobra (Marco Braida)]

 apt-cache policy qgis-server
qgis-server:
  Installed: 2.18.17+dfsg-1
  Candidate: 2.18.17+dfsg-1
  Version table:
 *** 2.18.17+dfsg-1 500
        500 http://it.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status

..
...
Setting up qgis-providers (2.18.17+dfsg-1) ...
/usr/lib/qgis/crssync: error while loading shared libraries: libxerces-c-3.1.so: cannot open shared object file: No such file or directory
dpkg: error processing package qgis-providers (--configure):
 installed qgis-providers package post-installation script subprocess returned error exit status 127
dpkg: dependency problems prevent configuration of qgis-server:
 qgis-server depends on qgis-providers (= 2.18.17+dfsg-1); however:
  Package qgis-providers is not configured ye

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.