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so I am working on a project which will be a Lubuntu install without touching anything during the install process (except after a few seconds of quick input), and I want to uninstall lightdm and install SLiM (thanks to reasons of default session, lighterweight, and more) - however I do not want to have to run sudo dpkg-reconfigure lightdm unless I can do so in a way that does not require input. I tried to be clever and run sudo apt-get remove lightdm and then sudo apt-get install slim and I thought that would work. But when I booted into Lubuntu, it only showed wmaker, blackbox, and icewm as options for sessions. Please help!

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You can try preseeding a debconf selection and then use a non-interactive frontend for dpkg-reconfigure. First find the correct key for preseeding:

$ debconf-get-selections | grep lightdm
# Choices: gdm, lightdm
gdm     shared/default-x-display-manager        select  lightdm
lightdm shared/default-x-display-manager        select  lightdm

So set, perhaps:

sudo debconf-set-selections <<EOF
slim    shared/default-x-display-manager        select  slim
lightdm shared/default-x-display-manager        select  slim
EOF

Then either of, depending on whether you already have slim installed:

DEBIAN_FRONTEND="noninteractive" dpkg-reconfigure lightdm
DEBIAN_FRONTEND="noninteractive" apt-get install slim
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  • Lol. I don't have enough rep to upvote. Sorry. I will check this out, may work well sense we are already using preseeding. Do you think this will solve the issue I'm having though? Because another command I ran was sudo apt-get remove apt-get install lxdeand lubuntu-desktop for compatibility reasons with SLiM
    – Crutchcorn
    Dec 27, 2014 at 12:59
  • To no prevail. Funny enough, I went into bash (to test this out) after running everything, and reinstalled lightdm, and strange enough when I did 'debconf-get-selections | grep lightdm' it showed 'select slim' already; making me think that my cheapness of my uninstalling lightdm first worked. Now why does it not show xsessions as sessions and only shows wmaker, blackbox, and icewm...
    – Crutchcorn
    Dec 27, 2014 at 13:34
  • Confirmed not updating xession. Tried installing another DE and it did not show up in SLiM
    – Crutchcorn
    Dec 27, 2014 at 13:55

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