autoremove; better comment

ch1/pkg_install4ubuntu_lkp.sh

@@ -2,7 +2,7 @@
 # pkg_install4ubuntu_lkp.sh
 # ***************************************************************
 # This program is part of the source code released for the book
-#  "Linux Kernel Programming 2E"
+#  "Linux Kernel Programming" 2E
 #  (c) Author: Kaiwan N Billimoria
 #  Publisher:  Packt
 #  GitHub repository:
@@ -26,6 +26,7 @@ runcmd()
 
 #--- 'main'
 echo "$(date): beginning installation of required packages..."
+# ASSUMPTION! root partition / is on /dev/sda1
 spc1=$(df|grep sda1|awk '{print $3}')
 echo "Disk space in use currently: ${spc1} KB"
 
@@ -70,4 +71,6 @@ groups |grep -q -w vboxsf || runcmd sudo usermod -G vboxsf -a ${USER}
 
 spc2=$(df|grep sda1|awk '{print $3}')
 echo "Difference : ($spc2 - $spc1) : $((spc2-spc1)) KB"
+
+sudo apt autoremove
 exit 0