Update

src/modules/displaymanager/displaymanager.conf

@@ -0,0 +1,80 @@
+# SPDX-FileCopyrightText: no
+# SPDX-License-Identifier: CC0-1.0
+#
+# Configure one or more display managers (e.g. SDDM)
+# with a "best effort" approach.
+#
+# This module also sets up autologin, if the feature is enabled in
+# globalstorage (where it would come from the users page).
+---
+# The DM module attempts to set up all the DMs found in this list, in the
+# precise order listed. The displaymanagers list can also be set in
+# globalstorage, and in that case it overrides the setting here.
+#
+# If *sysconfigSetup* is set to *true* (see below, only relevant for
+# openSUSE derivatives) then this list is ignored and only sysconfig
+# is attempted. You can also list "sysconfig" in this list instead.
+#
+displaymanagers:
+  - slim
+  - sddm
+  - lightdm
+  - gdm
+  - mdm
+  - lxdm
+  - greetd
+
+# Enable the following settings to force a desktop environment
+# in your displaymanager configuration file. This will attempt
+# to configure the given DE (without checking if it is installed).
+# The DM configuration for each potential DM may **or may not**
+# support configuring a default DE, so the keys are mandatory
+# but their interpretation is up to the DM configuration.
+#
+# Subkeys of *defaultDesktopEnvironment* are (all mandatory):
+#  - *executable* a full path to an executable
+#  - *desktopFile* a .desktop filename
+#
+# If this is **not** set, then Calamares will look for installed
+# DE's and pick the first one it finds that is actually installed.
+#
+# If this **is** set, and the *executable* key doesn't point to
+# an installed file, then the .desktop file's TryExec key is
+# used instead.
+#
+
+#defaultDesktopEnvironment:
+#    executable: "startkde"
+#    desktopFile: "plasma"
+
+#If true, try to ensure that the user, group, /var directory etc. for the
+#display manager are set up correctly. This is normally done by the distribution
+#packages, and best left to them. Therefore, it is disabled by default.
+basicSetup: false
+
+# If true, setup autologin for openSUSE. This only makes sense on openSUSE
+# derivatives or other systems where /etc/sysconfig/displaymanager exists.
+#
+# The preferred way to pick sysconfig is to just list it in the
+# *displaymanagers* list (as the only one).
+#
+sysconfigSetup: false
+
+# Some DMs have specific settings. These can be customized here.
+#
+# greetd has configurable user and group; the user and group is created if it
+# does not exist, and the user is set as default-session user.
+#
+# Some greeters for greetd (e.g gtkgreet or regreet) have support for a user's GTK CSS style to change appearance.
+#
+# lightdm has a list of greeters to look for, preferring them in order if
+# they are installed (if not, picks the alphabetically first greeter that is installed).
+#
+greetd:
+  greeter_user: "tom_bombadil"
+  greeter_group: "wheel"
+  greeter_css_location: "/etc/greetd/style.css"
+lightdm:
+  preferred_greeters: ["lightdm-greeter.desktop", "slick-greeter.desktop"]
+sddm:
+  configuration_file: "/etc/sddm.conf.d/autologin.conf"

src/modules/shellprocess/shellprocess_final_chrooted.conf

@@ -153,3 +153,5 @@ script:
   - "-rm /etc/systemd/system/multi-user.target.wants/mount-data-flash.service"
   - "-rm /etc/systemd/system/dnscrypt-proxy-resolv.conf.service"
   - "-rm /etc/systemd/system/network-online.target.wants/dnscrypt-proxy-resolv.conf.service"
+
+  - "-chown -R sddm:sddm /var/lib/sddm"