An initial version of the debian ledgersmb-1.6 package version for LedgerSMB v1.6.10 has been created and uploaded to our PPA[1], for Ubuntu 'disco' (v19.04) and 'cosmic' (v18.10) as well as for 'bionic' (v18.04 LTS). (The debian source packages are available as well.)
The packages at our PPA: ledgersmb-1.6 ledgersmb-1.6-apache ledgersmb-1.6-lighttpd ledgersmb-1.6-nginx ledgersmb-1.6-varnish
Only the main 'ledgersmb-1.6' package is required; the others are related to which web proxy you might want to use and you only need one of them. (They depend on their respective web proxy applications and attempt to do at least some setup for them.)
Note that I haven't created a ledgersmb-1.6 package yet at our apt package repository[2] for Debian 'Buster' (which is expected to be Debian v10) as that Debian version has not yet been released. It is, however, expected later this year so if people would like that I start making it available as well, please let me know.