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    Uninstall KDM in KDE 4.9.3

    Hello people, I have Kubuntu 12.10 with KDE 4.9.3 but when installing an error ocurred and the configuration screen closed, now I have LightDM and KDM, how could I do to securely remove KDM? I hate KDM, it does not have the correct resolution for my monitor.

    #2
    Try opening a terminal and entering:
    sudo dpkg-reconfigure kdm

    And then select LightDM from there. That won't uninstall KDM, but the next time you reboot, LightDM should be your login manager.

    After you successfully reboot and login with LightDM, you can always open a terminal and sudo apt-get remove kdm but you should check and see if it is also going to remove anything else that might be dependent on it that you might want. It doesn't hurt to have both installed, the system can only use one or the other.
    Last edited by vw72; Nov 23, 2012, 10:11 PM.

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      #3
      KDM can't be uninstalled without removing a significant portion of your installation. LightDM depends on KDM.
      Windows no longer obstructs my view.
      Using Kubuntu Linux since March 23, 2007.
      "It is a capital mistake to theorize before one has data." - Sherlock Holmes

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        #4
        Originally posted by Snowhog View Post
        KDM can't be uninstalled without removing a significant portion of your installation. LightDM depends on KDM.
        Didn't know that, but the sudo reconfigure kdm should still allow lightdm to be selected!

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          #5
          Thanks, I solved it tonight, as vw72 suggested I used sudo dpkg-reconfigure but lightdm instead of kdm:

          sudo dpkg-reconfigure lightdm

          Then I uninstalled kdm because it was pointless to have both,

          sudo apt-get remove kdm

          And problem solved thanks a lot.

          Comment


            #6
            Originally posted by Snowhog View Post
            KDM can't be uninstalled without removing a significant portion of your installation. LightDM depends on KDM.
            No, they are entirely separate entities actually

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              #7
              Originally posted by claydoh View Post
              No, they are entirely separate entities actually
              I was just a tad hesitant when I posted my comment. Yours jogged my memory a bit.

              If you only have KDM installed, and want to only have LightDM, you must install LightDM first, removing KDM (if you truly don't want it on your system) afterwards. If you remove KDM when you don't have any other DE installed, a lot of your system goes bye-bye with it.
              Windows no longer obstructs my view.
              Using Kubuntu Linux since March 23, 2007.
              "It is a capital mistake to theorize before one has data." - Sherlock Holmes

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                #8
                You do not need a login manager at all if you don't want one KDM is only connected to the meta-package kubuntu-desktop so removing it does not take away anything from your system

                claydoh@claydoh-Latitude-D630:~$ sudo apt-get remove kdm
                Reading package lists... Done
                Building dependency tree
                Reading state information... Done
                The following packages will be REMOVED:
                kdm kubuntu-desktop
                0 upgraded, 0 newly installed, 2 to remove and 0 not upgraded.
                After this operation, 2,833 kB disk space will be freed.
                Do you want to continue [Y/n]?
                claydoh@claydoh-Latitude-D630:~$ lsb_release -a
                Distributor ID: Ubuntu
                Description: Ubuntu 12.04.1 LTS
                Release: 12.04
                Codename: precise

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                  #9
                  Well, I guess it's time to refill "Sherlock Tux's" pipe, as obviously, he's "sucking air" on this.

                  Windows no longer obstructs my view.
                  Using Kubuntu Linux since March 23, 2007.
                  "It is a capital mistake to theorize before one has data." - Sherlock Holmes

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                    #10
                    Originally posted by claydoh View Post
                    You do not need a login manager at all if you don't want one KDM is only connected to the meta-package kubuntu-desktop so removing it does not take away anything from your system
                    But removing kubuntu-desktop can cause major problems when upgrading to the next version of kubuntu.

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                      #11
                      Easier to keep both, or even have gdm available also. I've messed up one and had to switch to the other so I (a simple User) could repair things.
                      GigaByte GA-965G-DS3, Core2Duo at 2.1 GHz, 4 GB RAM, ASUS DRW-24B1ST, LiteOn iHAS 324 A, NVIDIA 7300 GS, 500 GB and 80 GB WD HDD

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                        #12
                        Originally posted by claydoh View Post
                        You do not need a login manager at all if you don't want one KDM is only connected to the meta-package kubuntu-desktop so removing it does not take away anything from your system
                        Changed in 12.10. The dependency on KDM is gone:
                        Code:
                        steve@t520:~$ [B]apt-cache rdepends kdm[/B]
                        kdm
                        Reverse Depends:
                          kdm:i386
                          kde-workspace
                          kdm:i386
                          kde-workspace
                          kdm:i386
                          plymouth:i386
                          kdm-gdmcompat
                          kdm-gdmcompat
                          kde-workspace
                          kde-wallpapers
                          kde-wallpapers
                          kde-plasma-netbook
                          kde-plasma-desktop
                          plymouth
                          numlockx

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