/usr/share/terminfo/t/tvi920c-unk-vb is in ncurses-term 6.1-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/terminfo/t/tvi920b-vb-unk
/usr/share/terminfo/t/tvi920b-vb-unk