Not overwrite USERGROUP_ENAB on anything but Ubuntu

The nonsense with umask is introduced by Canonical's infinite wisdom: https://git.launchpad.net/ubuntu/+source/pam/tree/debian/patches/pam_umask_usergroups_from_login.defs.patch?h=ubuntu/noble
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=583958
We don't need to break sensible distributions because of Ubuntu nonsenses

Signed-off-by: Tommy <contact@tommytran.io>

install.sh

@@ -22,6 +22,8 @@ unpriv(){
     sudo -u nobody "$@"
 }
 
+installation_date=$(date "+%Y-%m-%d %H:%M:%S")
+
 # Check if this is a VM
 virtualization=$(systemd-detect-virt)
 
@@ -266,15 +268,14 @@ fi
 ## Set the default BTRFS Subvol to Snapshot 1 before pacstrapping
 btrfs subvolume set-default "$(btrfs subvolume list /mnt | grep "@/.snapshots/1/snapshot" | grep -oP '(?<=ID )[0-9]+')" /mnt
 
-## Temporarily hardcode the date here, will make it work with proper date later.
-echo '<?xml version="1.0"?>
+echo "<?xml version=\"1.0\"?>
 <snapshot>
   <type>single</type>
   <num>1</num>
-  <date>1999-03-31 0:00:00</date>
+  <date>${installation_date}</date>
   <description>First Root Filesystem</description>
   <cleanup>number</cleanup>
-</snapshot>' > /mnt/@/.snapshots/1/info.xml
+</snapshot>" > /mnt/@/.snapshots/1/info.xml
 
 chmod 600 /mnt/@/.snapshots/1/info.xml
 
@@ -595,7 +596,6 @@ fi
 ## Set umask to 077.
 sed -i 's/^UMASK.*/UMASK 077/g' /mnt/etc/login.defs
 sed -i 's/^HOME_MODE/#HOME_MODE/g' /mnt/etc/login.defs
-sed -i 's/^USERGROUPS_ENAB.*/USERGROUPS_ENAB no/g' /mnt/etc/login.defs
 sed -i 's/umask 022/umask 077/g' /mnt/etc/bash.bashrc
 
 # Finish up