don't assume root partition; cleanup

ch1/pkg_install4ubuntu_lkp.sh

@@ -25,14 +25,17 @@ runcmd()
 {
     [[ $# -eq 0 ]] && return
     echo "$@"
-    eval "$@" || die "failed"
+    eval "$@" || echo "*** failed ***"
 }
 
 #--- '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: ${spc1} KB"
+
+# Get the root partition; we ASSUME you're using it...
+ROOT_PART=$(df |grep -w "/"|awk '{print $1}')
+[[ -z "${ROOT_PART}" ]] && die "Couldn't get root partition"
+spc1=$(df|grep ${ROOT_PART}|awk '{print $3}')
+[[ ! -z "${spc1}" ]] && echo "Disk space in use currently: ${spc1} KB"
 
 runcmd sudo apt update
 echo "-----------------------------------------------------------------------"
@@ -57,7 +60,7 @@ runcmd sudo apt install -y \
 	fakeroot flawfinder \
 	git gnome-system-monitor gnuplot hwloc indent kmod \
 	libnuma-dev linux-headers-$(uname -r) linux-tools-$(uname -r) \
-	man-db net-tools numactl openjdk-18-jre  \
+	man-db net-tools numactl openjdk-22-jdk \
 	perf-tools-unstable procps psmisc python3-distutils  \
 	rt-tests smem sparse stress stress-ng sysfsutils \
 	tldr-py trace-cmd tree tuna virt-what yad
@@ -72,12 +75,13 @@ echo "-----------------------------------------------------------------------"
 #  libelf-dev                      elfutils-libelf-devel
 #---
 
-# Add yourself to the vboxsf group (to gain access to VirtualBox shared folders);
-# will require you to log out and back in (or even reboot) to take effect
+# As an aside, lets add ourseleves to the vboxsf group (to gain access to
+# VirtualBox shared folders); will require you to log out and back in
+# (or even reboot) to take effect
 groups |grep -q -w vboxsf || runcmd sudo usermod -G vboxsf -a ${USER}
 
-spc2=$(df|grep sda1|awk '{print $3}')
-echo "Difference : ($spc2 - $spc1) : $((spc2-spc1)) KB"
-
 runcmd sudo apt autoremove
+
+spc2=$(df|grep ${ROOT_PART}|awk '{print $3}')
+[[ ! -z "${spc1}" && ! -z "${spc2}" ]] && echo "Disk space difference : ($spc2 - $spc1) : $((spc2-spc1)) KB"
 exit 0