How to change the font in the terminal of server?

Try the following command:

sudo dpkg-reconfigure console-setup

The Ubuntu font has no monospaced version, so it's not suited for use in a terminal or console that has fixed width character cells.

In addition, console fonts are special bitmap fonts, not TrueType/OpenType fonts (but OTOH it shouldn't be too difficult to create a console font from a monospaced TrueType font).