Go to Preferences > Settings - User and add the following:
"font_face": "Ubuntu Mono", "font_size": 10, "font_options": [],
If this does not work, try changing the font . There are many options in Google Fonts . You just need to add the necessary fonts to your collection, click the download icon in the upper right corner and install .ttf on your system, which should be as simple as opening files and clicking on install.
Monospace is the default font on most Linux systems, but you can change it to whatever you like. However, I personally prefer the default "Ubuntu Mono" font.
The font_option array must be empty. Sublime Text allows you to add options such as "no_bold", "no_italic", "no_antialias", etc.
Finally, make sure that you are editing the Settings - User page, not the Settings - Default page.
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