Provided by: dpkg-dev_1.21.1ubuntu2_all bug

NAME

       deb-preinst - package pre-installation maintainer script

SYNOPSIS

       DEBIAN/preinst

DESCRIPTION

       A package can perform several pre-installation actions via maintainer scripts, by
       including an executable preinst file in its control archive (i.e. DEBIAN/preinst during
       package creation).

       The script can be called in the following ways:

       new-preinst install
           Before the package is installed.

       new-preinst install old-version new-version
           Before removed package is upgraded.

           The new-version is passed only since dpkg 1.18.5.

       new-preinst upgrade old-version new-version
           Before the package is upgraded.

           The new-version is passed only since dpkg 1.18.5.

       old-preinst abort-upgrade new-version
           If postrm fails during upgrade or fails on failed upgrade.

SEE ALSO

       dpkg(1).