changed qemu lxc check

debian/debian-essentials.sh

@@ -51,17 +51,11 @@ apt-get update
 apt-get upgrade -y
 
 # check if vm or lxc
-if [[ ! -d /dev/disk/by-id ]]
+if [[ -f /dev/.lxc-boot-id ]]
     then
-        apt-get install -y qemu-guest-agent
+        apt-get remove -y qemu-guest-agent
     else
-        isInFile=$(ls /dev/disk/by-id | grep -c "QEMU")
-            if [ $isInFile -eq 0 ]
-                then
-                    apt-get remove -y qemu-guest-agent
-                else
-                    apt-get install -y qemu-guest-agent
-            fi
+        apt-get install -y qemu-guest-agent
 fi
 
 # download and install packages