Install rxvt by entering the following commands in the terminal:
sudo apt update sudo apt install rxvt
Description:
dummy transitional package for rxvt-unicode
This is a dummy transitional package transitioning rxvt to rxvt-unicode. Once you've migrated your session startup to not call /usr/bin/rxvt-*, it can be safely removed.
Homepage: http://software.schmorp.de/pkg/rxvt-unicode.html
Version: 1:2.7.10-7.1+urxvt9.22-3
Section: universe/x11