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deb-preinst(5)                               dpkg suite                               deb-preinst(5)



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).



1.21.1                                       2025-09-09                               deb-preinst(5)