Install dvipng by entering the following commands in the terminal:
sudo apt update sudo apt install dvipng
convert DVI files to PNG graphics
dvipng makes PNG graphics from DVI files as obtained from TeX and its relatives. It is intended to produce anti-aliased screen-resolution images as fast as is possible. This makes dvipng suitable for generating large amounts of images on-the-fly. . dvipng does not read the postamble, so it can be started before TeX finishes. It can read options interactively through stdin, and all options are usable. One can even change the input file through this interface. . dvipng supports PK, VF, PostScript Type1, and TrueType fonts, color specials and simple PostScript inclusion specials.