When I opened a log file in my Ubuntu server, my server font changed to obscure character according to this picture:

How can I restore it to the regular font?
When I opened a log file in my Ubuntu server, my server font changed to obscure character according to this picture:

How can I restore it to the regular font?
Try the reset command, ie. just type reset into your terminal to reset.
The command clear could also work, but it's primary function is to clear the display, where reset is really what you want.
It's really useful if you're coding and using escape characters to change something in the terminal by make a typo & screw something up, or you cat a binary file and find yourself in the same position.
clear was introduced in 1979 because it was common for terminals to be of different brand and use different escape sequences (VT52, VT100 etc). reset is another variation
I know its funny but associate on some instruction on other solution I try to open some file with nano and terminal CHARSET have been changed to default view.
I don't know why and not any idea on this problem.