Rationale
My Linux Mint 18.3 installed on Clevo N240GU was a long-term support (LTS) version. Although the official page didn’t recommend an upgrade for its own sake, I still performed it as a result of my conversation with a technician in a computer store. He thought that the display problem in the current version would be fixed in this upgraded version.
The old version of Linux Mint couldn’t detect the onboard Intel
graphics card. Therefore, sensors reported a higher CPU temperature
and the display resolution couldn’t be correctly configured.