Finalized core changes

src/COPY_OVER_TO_CHROOT/CLEANUP.sh

@@ -0,0 +1,24 @@
+# If we installed software, be sure to run
+rm /var/lib/dbus/machine-id
+
+
+# Before exiting the chroot, remove the diversion:
+# Earlier this guide asked you to make a backup copy of /sbin/initctl.
+# If the following command does not restore this file, then restore from the backup copy you made.
+rm /sbin/initctl
+dpkg-divert --rename --remove /sbin/initctl
+
+
+# Remove old kernels
+ls /boot/vmlinuz-5.4.**-**-generic > list.txt
+sum=$(cat list.txt | grep '[^ ]' | wc -l)
+
+if [ $sum -gt 1 ]; then
+    dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge
+fi
+rm list.txt
+
+
+apt-get clean
+rm -rf /tmp/*
+rm /etc/resolv.conf