Replace KDM over lightdm

[claydoh]

he is running 12.04, and using the kubuntu-backports repo. All good on that factor

You should just have to apt-get update, followed by a dist-upgrade first, then install kdm. However, isn't KDM the default in 12.04 anyway? If you have installed lightdm, and have not removed kdm, you can reconfigure Kubuntu to use whichever login manager you want, if it is installed.

sudo dpkg-reconfigure kdm

[coderus]

what repo you using? o_O

apt-cache show kdm
Package: kdm
Priority: optional
Section: universe/kde
Installed-Size: 2691
Maintainer: Kubuntu Developers <kubuntu-devel@lists.ubuntu.com>
Original-Maintainer: Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>
Architecture: i386
Source: kde-workspace
Version: 4:4.9.2-0ubuntu2.1
Replaces: kde-kdm-themes, kdmtheme
Provides: x-display-manager
Depends: kde-runtime, libc6 (>= 2.15), libck-connector0 (>= 0.2.1), libdbus-1-3 (>= 1.0.2), libkdecore5 (>= 4:4.9.2), libkdeui5 (>= 4:4.9.2), libkio5 (>= 4:4.9.2), libknewstuff3-4 (>= 4:4.9.2), libkworkspace4abi2 (= 4:4.9.2-0ubuntu2.1), libpam0g (>= 0.99.7.1), libqimageblitz4 (>= 1:0.0.4), libqt4-svg (>= 4:4.5.3), libqt4-xml (>= 4:4.5.3), libqtcore4 (>= 4:4.7.0~beta1), libqtgui4 (>= 4:4.8.0), libstdc++6 (>= 4.1.1), libx11-6, libxau6, libxdmcp6, libxtst6, debconf (>= 0.5) | debconf-2.0, lsb-base (>= 3.2-14), consolekit, upstart-job, kde-workspace-kgreet-plugins (= 4:4.9.2-0ubuntu2.1), adduser, kde-wallpapers-default
Recommends: logrotate, xserver-xorg | xserver, kde-workspace | x-session-manager | x-window-manager, xterm | x-terminal-emulator
Suggests: kdepasswd, kde-wallpapers
Breaks: kde-kdm-themes, kdmtheme
Filename: pool/universe/k/kde-workspace/kdm_4.9.2-0ubuntu2.1_i386.deb
Size: 929912
MD5sum: 2280ef66b94151a4e3c972c43df14620
SHA1: 3d5f3e33dce65d174b0beb9599d00c6ea76e2c1c
SHA256: 05c3e267119ab13d1171c6175cff65c3d47d11b6fac8190742038ef2caf01f4d
Description-en: 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/
Description-md5: 162cb026b8b58a10982e2958a61a9dab
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu

[sharopo]

Hello, sorry to bump. When I attempt to install kdm I get the following error and am at a complete loss. Any help would be appreciated.

~$ sudo apt-get -f install kdm
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 kdm : Depends: libkworkspace4abi2 (= 4:4.9.3-0ubuntu0.1~ppa2) but 4:4.9.3-0ubuntu1~ubuntu12.04.1~ppa3 is to be installed
       Depends: kde-workspace-kgreet-plugins (= 4:4.9.3-0ubuntu0.1~ppa2) but 4:4.9.3-0ubuntu1~ubuntu12.04.1~ppa3 is to be installed
E: Unable to correct problems, you have held broken packages.

[SteveRiley]

kubuntu-desktop has a hard dependency on lightdm-kde-greeter, which in turn depends on lightdm, so even though you can install KDM and configure it to be the default display manager (which I always do), you can't remove LightDM without removing the Kubuntu Desktop metapackage.

[blackpaw]

No need to remove it. Just install KDM and make it the default WM.

apt-get install kdm
dpkg-reconfigure kdm

and chose kdm as the WM

[Spadge]

Should be fine. What's the worst that can happen?

If LightDM/KDM fails, you can still log in to the CLI and fix it, right?

[rec9140]

Whats the best way to completely remove and replace lightdm with KDM.

I use XDMCP extensively and I also prefer KDM.

apt-get purge lightdm-kde
apt-get install kdm



Seems dangerous and risky for a key component of logging into the system that these managers serve.

Thanks.