I made room on my hard drive that has Mint 17.3 on it as my primary OS. I made 3 partitions, root, swap, and home using Ext4. I booted the computer with the Mint 18 DVD and installed Mint 18 to the partitions that I made on the hard drive using Gparted. It installed in about 20 minutes, and it recognized all of my hardware. I built this computer 10 years ago and it is still running strong. It has a Gigabyte Mother board, AMD 64 CPU, 4 Gb of ram, a server case with 4 swapable hard drives. I got all of the updates available at that time. I then copied my Thunder Bird and Firefox, along with Documents and Pictures from my Mint 17.3 Home partition. Everything has been working fine until a thunderbird update which I got today. For some reason after I close it I will get a error message saying
“Were Sorry Mozilla Has Crashed” It then gives me a choice of restarting or closing. Other than that everything is working fine so far. I still have my Mint 17.3 to fall back on if Mint 18 Becomes problematic. or develops a serious problem. So far I am pleased with Mint 18 and it appears to run a tad faster. Will write more after I have used it more. I’ve only had it for a week now.