Replace KDM over lightdm

[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.

[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?

[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

[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.

[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.

[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

[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

[sharopo]

Sorry, I'm running 12.10, and doing the updates did not work. Is kdm just not supported on 12.10 at all anymore? I have seen some posts about people being able to install it.

[coderus]

try
sudo apt-get install kdm=4:4.9.2-0ubuntu2.1

[sharopo]

I get the same error as before. /:

[coderus]

dpkg -l kdm ?

[sharopo]

~$ dpkg -l kdm
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version      Architecture Description
+++-==============-============-============-==================================
rc  kdm            4:4.9.3-0ubu amd64        KDE Display Manager for X11

[coderus]

what is your apt-cache show kdm ?

[sharopo]

~$ apt-cache show kdm
Package: kdm
Status: deinstall ok config-files
Priority: optional
Section: x11
Installed-Size: 2802
Maintainer: Kubuntu Developers <kubuntu-devel@lists.ubuntu.com>
Architecture: amd64
Source: kde-workspace
Version: 4:4.9.3-0ubuntu1~ubuntu12.04.1~ppa3
Config-Version: 4:4.9.3-0ubuntu1~ubuntu12.04.1~ppa3
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 (>= 4:4.9.3), libkdeui5 (>= 4:4.9.3), libkio5 (>= 4:4.9.3), libknewstuff3-4 (>= 4:4.9.3), libkworkspace4abi2 (= 4:4.9.3-0ubuntu1~ubuntu12.04.1~ppa3), 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 (= 4:4.9.3-0ubuntu1~ubuntu12.04.1~ppa3), 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
Conffiles:
 /etc/pam.d/kdm f8e043e7de6dd93d537ffe72a2fbae75
 /etc/pam.d/kdm-np 527a9b02acd0858ea7e061e29e3f127c
 /etc/kde4/kdm/kdm.options a1c3b5cec366daed61487fbd760be5a2
 /etc/kde4/kdm/Xsetup 9faeb5bdf71e8338f03f0a3df2a01f87
 /etc/kde4/kdm/Xwilling ab97870cde0424d576375813874a304e
 /etc/kde4/kdm/Xstartup 0821820c79fabf5009939626144a03ef
 /etc/kde4/kdm/README e22153008a45ad278940020fc4594e70
 /etc/kde4/kdm/kdmrc fe8c6ff6b943ca88c876352bc6a793a3
 /etc/kde4/kdm/Xsession 9ae86149a17f326a256e338bd352e11d
 /etc/kde4/kdm/Xreset 514c4b4a0f42640916fac03574f843d9
 /etc/kde4/kdm/Xaccess 03b7b6cd8eacc152567b7f4a3ae9f537
 /etc/kde4/kdm/backgroundrc 2ae4df1d13f2a8eae3ee2a965277205f
 /etc/init/kdm.conf 53071169f74deaef06f64365996265f0
 /etc/logrotate.d/kdm a07bff9d80d56119f8db95696445f86a
 /etc/dbus-1/system.d/org.kde.kcontrol.kcmkdm.conf f3a5c84af8ce5582747f760c20308e45
 /etc/insserv.conf.d/kdm d3a7ab4b48c90e2a0b609fcfa3b8b064
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/
Original-Maintainer: Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>

Package: kdm
Source: kde-workspace
Priority: optional
Section: x11
Installed-Size: 2754
Maintainer: Kubuntu Developers <kubuntu-devel@lists.ubuntu.com>
Architecture: amd64
Version: 4:4.9.3-0ubuntu0.1~ppa2
Recommends: logrotate, xserver-xorg | xserver, kde-workspace | x-session-manager | x-window-manager, xterm | x-terminal-emulator
Replaces: kde-kdm-themes, kdmtheme
Suggests: kdepasswd, kde-wallpapers
Provides: x-display-manager
Depends: kde-runtime, libc6 (>= 2.15), libck-connector0 (>= 0.2.1), libdbus-1-3 (>= 1.0.2), libkdecore5 (>= 4:4.9.3), libkdeui5 (>= 4:4.9.3), libkio5 (>= 4:4.9.3), libknewstuff3-4 (>= 4:4.9.3), libkworkspace4abi2 (= 4:4.9.3-0ubuntu0.1~ppa2), 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 (= 4:4.9.3-0ubuntu0.1~ppa2), adduser, kde-wallpapers-default
Breaks: kde-kdm-themes, kdmtheme
Filename: pool/main/k/kde-workspace/kdm_4.9.3-0ubuntu0.1~ppa2_amd64.deb
Size: 998250
MD5sum: b343ffd88df3abd45fc572864a07722f
SHA1: 14a65fb8d8e1b369d91e43cd33ec411568a8d4cc
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.
Original-Maintainer: Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>

Package: kdm
Priority: optional
Section: universe/kde
Installed-Size: 2754
Maintainer: Kubuntu Developers <kubuntu-devel@lists.ubuntu.com>
Original-Maintainer: Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>
Architecture: amd64
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_amd64.deb
Size: 917494
MD5sum: 10ac68d89dda59eeaf91e726e95d90d4
SHA1: 8fbeca3c0b70d65540406fb6edf988fcdc083a00
SHA256: f4fcd2f7559ec152d0cc9003c5a5614be5314a4a6308fa82eaf8db94d163c7af
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

Package: kdm
Priority: optional
Section: universe/kde
Installed-Size: 2754
Maintainer: Kubuntu Developers <kubuntu-devel@lists.ubuntu.com>
Original-Maintainer: Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>
Architecture: amd64
Source: kde-workspace
Version: 4:4.9.2-0ubuntu2
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), 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), 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_amd64.deb
Size: 916528
MD5sum: c6ce8629d1fe68ddc14e87a876563bf8
SHA1: 514e168e2ac00725f7f0a5ad037dd5862858c8a9
SHA256: 6ad42864344699598d25bfe962b5ac1f7fc118674ed62d2ddd77009bcd89c709
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

[coderus]

seems you have some bad repository. show your repo list and try
sudo apt-get install kdm=4:4.9.3-0ubuntu0.1~ppa2