dpkg -l emacs-snapshot returns:
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-===========================================-============-========================================
ii emacs-snapshot 2:20221017+emacs-28.2-159651-geff4a4f49a7-1 amd64 GNU Emacs editor (with GTK+ GUI support)
emacs-repository-version is nil.
Many thanks for your help,
Geoff