$ aptitude show chromium-browser/xenial | grep -i version
Version: 55.0.2883.87-0ubuntu0.16.04.1263
Description: Chromium web browser, open-source version of Chrome
$ aptitude show chromium-browser/xenial-security | grep -i version
Version: 55.0.2883.87-0ubuntu0.16.04.1263
Description: Chromium web browser, open-source version of Chrome
Hmm, seems to work for me:
$ aptitude show chromium- browser/ xenial | grep -i version 87-0ubuntu0. 16.04.1263
Version: 55.0.2883.
Description: Chromium web browser, open-source version of Chrome
$ aptitude show chromium- browser/ xenial- security | grep -i version 87-0ubuntu0. 16.04.1263
Version: 55.0.2883.
Description: Chromium web browser, open-source version of Chrome