Debian packaging: normalize maintainer scripts, relax libsagui dependency, and harden postinst DB/bootstrap checks#18

Al-Muhandis merged 2 commits intomainAl-Muhandis/AdminHelper:mainfrom

codex/fix-post-installation-script-for-tgadmin-qf3ckgAl-Muhandis/AdminHelper:codex/fix-post-installation-script-for-tgadmin-qf3ckgCopy head branch name to clipboard