Yesterday I had to shut down and remove my usb with mint mate and reboot into cinnamon. This went ok nothing really unusual.
However when I went to turn on the firewall in terminal it normally asks to be in sudo.
Sudo asks for authentication and you get a blinking cursor [normal] When you type in your password nothing is supposed to show.
A security feature of linux also normal. However this time when I typed in my password it started showing the pasword in PLAIN TEXT.
Luckyly I only typed in 4 letters of my 15 digit mixed alpha numeric and symbol password.
When I noticed I immediately closed out terminal waited 8 minutes and retried. Three letters showed up again in Plain text. Once again I closed out terminal. I waited 1 hour and was successful turning on the firewall without issue.
Everything I read on this says it should not be able to happen.
Anyone have any ideas.