Provided by: dpkg-dev_1.22.21ubuntu4_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 a 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).

1.22.21                                            2025-10-16                                     deb-preinst(5)