---
name: "update-cudf-solvers"
section: "8"
platform: "linux"
package: "apt-cudf"
version: "7.0.0-6+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/update-cudf-solvers"
---

# update-cudf-solvers(8)

register available CUDF solvers as APT external solvers

## NAME

update-cudf-solvers - register available CUDF solvers as APT external solvers

## SYNOPSIS

- **update-cudf-solvers** \[*OPTION*\]...

  - **update-cudf-solvers** \[*OPTION*\]... --remove

  - **update-cudf-solvers** \[*OPTION*\]... --list

  ## DESCRIPTION

update-cudf-solvers maintain the list of installed CUDF solvers and register them as external solvers for APT.

The first form (without mandatory options) should be invoked each time a new CUDF solver specification file is added to or removed from the CUDF solver specification directory (by default */usr/share/cudf/solvers*). update-cudf-solvers will synchronize the differences with APT external solvers, by installing suitable symlinks to the */usr/bin/apt-cudf* wrapper under */usr/lib/apt/solvers*.

The second form (with the mandatory `"--remove"` option) will remove all installed external APT solvers that originated from CUDF solvers. It's a cleanup operation meant to be used only upon removal of the apt-cudf package.

The third form just lists available solvers and exit.

Note that other, non-CUDF based, APT external solvers might be present under */usr/lib/apt/solvers*. update-cudf-solvers leaves the untouched and act only on (present or past) APT solvers corresponding to CUDF solvers.

## TRIGGER-BASED OPERATION

The directory */usr/share/cudf/solvers* is monitored by a dpkg trigger that invokes update-cudf-solvers as needed. In all but exceptional circumstances, you should not be required to operate update-cudf-solvers manually.

## OPTIONS

- \-d

  - \--debug

  Print debugging information during operation.

- \-h

  - \--help

  Show usage information and exit.

- \-l

  - \--list

  List available solvers and exit. Both CUDF and APT's external solvers (AKA "EDSP solvers") will be listed.

- \-r

  - \--remove

  Unregister all CUDF solvers.

## SEE ALSO

[**apt-get**(8)](/apt-get/8.md), **apt-cudf**(8), README.cudf-solvers \<file:///usr/share/doc/apt-cudf/README.cudf-solvers\>, README.Debian \<file:///usr/share/doc/apt-cudf/README.Debian\>

## AUTHOR

Copyright: (C) 2011 Stefano Zacchiroli \<zack@debian.org\>

License: GNU Lesser General Public License (GPL), version 3 or above