FIX: linux: fix the building issue on Linux Mint 21.3 Virginia

github: bambulab#3874
author: https://github.com/lucianoloder

Change-Id: Ia3db6923d5dd68dba532d7bdba6f93f73cc51d59

BuildLinux.sh

@@ -8,7 +8,7 @@ FOUND_GTK2=$(dpkg -l libgtk* | grep gtk2)
 FOUND_GTK3=$(dpkg -l libgtk* | grep gtk-3)
 
 function check_available_memory_and_disk() {
-    FREE_MEM_GB=$(free -g -t | grep 'Mem:' | rev | cut -d" " -f1 | rev)
+    FREE_MEM_GB=$(free -g -t | grep 'Mem' | rev | cut -d" " -f1 | rev)
     MIN_MEM_GB=10
 
     FREE_DISK_KB=$(df -k . | tail -1 | awk '{print $4}')