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I just upgraded to Kubuntu 14.04, and when I went to reconfigure KDM (because I'm not a fan of the current theme), I realized that there was no way to add more themes, and there were only two there. How can I install themes for KDM?

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Login Screen

From the Kubuntu 12.10 the default login manager has been the LightDM: http://www.kubuntu.org/news/12.10-release. KDE System settings > Login Screen(LightDM)

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KDM

The KDE login manager can be installed to the Kubuntu. The package is kdm.

:~$ apt-cache show kdm

Package: kdm

Priority: optional

Section: universe/kde

...

Description: KDE Display Manager for X11

KDM manages a collection of X servers running on local or remote machines. It allows users to easily log into their preferred desktop environment, connect to a remote XDMCP server, or shut down the system. . KDM supports custom themes and can display a list of users with icons. Additional user icons can be found in the 'kdepasswd' package. . This package is part of the KDE base workspace module.

Homepage: http://www.kde.org/

After the installation the KDM themes can be installed from the KDE System settings > Login Screen - Theme tab - 'Get New Themes' or 'Install new theme'.

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The KDM control module can be started with the command:

kdesudo kcmshell4 kdm


:~$ kcmshell4 --help
Usage: kcmshell4 [Qt-options] [KDE-options] [options] module 

A tool to start single KDE control modules

Generic options:
  --help                    Show help about options
  --help-qt                 Show Qt specific options
  --help-kde                Show KDE specific options
  --help-all                Show all options
  --author                  Show author information
  -v, --version             Show version information
  --license                 Show license information
  --                        End of options

Options:
  --list                    List all possible modules

Arguments:
  module                    Configuration module to open
  --lang <language>         Specify a particular language
  --silent                  Do not display main window
  --args <arguments>        Arguments for the module

This is a workaround for the KDE bug: https://bugs.kde.org/show_bug.cgi?id=255453

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Thank you. I didn't know that Kubuntu shipped with lightDM instead of KDM. Just a heads up to anyone who needs to install themes for KDM, you need to be root to install any themes (this has been a bug for a while, it seems). To do this, open Konsole and type sudo systemsettings. Be sure to keep Konsole running, as pressing the close button on the window does not kill the process. –  Sil Apr 22 at 14:23

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