A package can perform several post-removal actions via maintainer
scripts, by including an executable postrm file in its control
archive (i.e. DEBIAN/postrm during package creation).
The script can be called in the following ways:
postrm remove
After the package was removed.
postrm purge
After the package was purged.
old-postrm upgrade new-version
After the package was upgraded.
new-postrm failed-upgrade old-version new-version
If the above upgrade call fails.
postrm disappear overwriter-package overwriter-version
After all of the packages files have been replaced.
new-postrm abort-install
If preinst fails during install.
new-postrm abort-install old-version new-version
If preinst fails during upgrade of removed package.
new-postrm abort-upgrade old-version new-version
If preinst fails during upgrade.
