Force shutdown was initiated. so far, installation was perfect and on linux mint.
You want to avoid that. It's not good for the file system. That's why there's a shutdown process.
As mentioned above, there's a terminal command or three that will maybe shut the device down. It's worth trying those as a stopgap.
Worst case, typically used for frozen system, is a set of magic keys and the word 'BUSIER' in reverse - that is REISUB.
I realize that the previous sentence is gibberish a a new Linux user. Fortunately, I've also written this:
What You Need To Know About Linux's Magic SysRq Key • Linux Tips
The magic SysRq key can help you deal with a frozen and unresponsive system. It avoids doing a hard reboot and the potential loss of data.
linux-tips.us
That'll explain it for you. That will perform a 'graceful shutdown', albeit with a hammer instead of finesse.
Just smashing and holding the power button is a bad idea as it may lead to data corruption, loss of data, and even potentially corrupting the file system. It's much like Windows in those regards. There are other file systems that I'm told are more forgiving, but I'm assuming you're using the default Ext4.